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根据公式：C=λ·f 可知声速C与频率f成正比，同一波型的超声波在同一材料中传播时高频的声波传播速度比低频大
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B.
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参考答案：
举一反三
【简答题】In the second half of the 14th century, English literature started to flourish with the appearance of writers like ______________, William Langland, John Cower, and others.
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【单选题】Rearden Metals is considering opening a strip mining operation to provide some of the raw materials needed in producing Rearden metal. The initial purchase of the land and the associated costs of open...
A.
0
B.
1
C.
2
D.
12
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【单选题】26岁妇女，停经12周，阴道不规则流血10余天，量不多暗红色，血中伴有小水泡物。妇科检查：BP150/90mHg，子宫前倾，如孕4个月大，两侧附件可触到鹅卵大、囊性、活动良好、表面光滑的肿物。本病例最可能诊断是
A.
双胎妊娠
B.
妊娠合并子宫肌瘤
C.
妊娠合并卵巢囊肿
D.
先兆流产
E.
葡萄胎
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【单选题】The appearance of Yao Ming and T-Mac has_____ the fans of a sure victory for the Huston Rocket in the coming NBA contest.
A.
accused
B.
expected
C.
convinced
D.
persuaded
查看完整题目与答案
【单选题】杨女士，26岁，停经12周，阴道不规则流血2周，量不多，暗红色，血中伴有小水泡状物，妇科检查：血压150/90mmHg，子宫前倾，如孕4个月大，两侧附件可触到鹅卵大、囊性、活动良好、表面光滑的肿物。该患者应考虑
A.
先兆流产
B.
妊娠合并卵巢囊肿
C.
妊娠合并子宫肌瘤
D.
双胎妊娠
E.
葡萄胎
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【单选题】The earth is unfrozen today with the appearance of ______.
A.
the methane blanket
B.
a mile-thick layer of ice
C.
new life forms
D.
the carbon dioxide
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【单选题】A 54-year-old previously healthy woman is hospitalized for pneumonia. On the 10th hospital day she is found to have swelling and tenderness of her right leg, which has developed over the past 48 hours...
A.
Trousseau syndrome
B.
Protein C deficiency
C.
Immobilization
D.
Pregnancy
E.
Chronic alcohol abuse
查看完整题目与答案
【单选题】某女士，26岁，停经12周，阴道不规则流血12天，血中伴有小水泡物，暗红色。妇科检查：血压150/80mmHg，子宫前倾位，如孕4个月大，两侧附件可触及到鹅蛋大小、囊性、活动良好的肿块。本病例最可能的诊断是（ ）。
A.
先兆流产
B.
葡萄胎
C.
妊娠合并子宫肌瘤
D.
妊娠合并卵巢囊肿
E.
双胎妊娠
查看完整题目与答案
【单选题】妇女，26岁，停经12周，阴道不规则流血10余日，量不多.暗红色，伴有小水泡物。妇科检查：血压150/90mmHg，子宫前倾，如孕4个月大，两侧附件可触到鹅蛋大.囊性.活动良好.表面光滑的肿物。本病最可能的诊断是( )。
A.
双胎妊娠
B.
妊娠合并子宫肌瘤
C.
妊娠合并卵巢囊肿
D.
先兆流产
E.
葡萄胎
查看完整题目与答案
【单选题】Materials science remained empirical until the end of the _________ century when materials science, as we now understand it, began with the appearance of Mendeleev’s periodic table.
A.
17th
B.
18th
C.
19th
D.
20th
查看完整题目与答案
相关题目：
【简答题】In the second half of the 14th century, English literature started to flourish with the appearance of writers like ______________, William Langland, John Cower, and others.
查看完整题目与答案
【单选题】Rearden Metals is considering opening a strip mining operation to provide some of the raw materials needed in producing Rearden metal. The initial purchase of the land and the associated costs of open...
A.
0
B.
1
C.
2
D.
12
查看完整题目与答案
【单选题】26岁妇女，停经12周，阴道不规则流血10余天，量不多暗红色，血中伴有小水泡物。妇科检查：BP150/90mHg，子宫前倾，如孕4个月大，两侧附件可触到鹅卵大、囊性、活动良好、表面光滑的肿物。本病例最可能诊断是
A.
双胎妊娠
B.
妊娠合并子宫肌瘤
C.
妊娠合并卵巢囊肿
D.
先兆流产
E.
葡萄胎
查看完整题目与答案
【单选题】The appearance of Yao Ming and T-Mac has_____ the fans of a sure victory for the Huston Rocket in the coming NBA contest.
A.
accused
B.
expected
C.
convinced
D.
persuaded
查看完整题目与答案
【单选题】杨女士，26岁，停经12周，阴道不规则流血2周，量不多，暗红色，血中伴有小水泡状物，妇科检查：血压150/90mmHg，子宫前倾，如孕4个月大，两侧附件可触到鹅卵大、囊性、活动良好、表面光滑的肿物。该患者应考虑
A.
先兆流产
B.
妊娠合并卵巢囊肿
C.
妊娠合并子宫肌瘤
D.
双胎妊娠
E.
葡萄胎
查看完整题目与答案
【单选题】The earth is unfrozen today with the appearance of ______.
A.
the methane blanket
B.
a mile-thick layer of ice
C.
new life forms
D.
the carbon dioxide
查看完整题目与答案
【单选题】A 54-year-old previously healthy woman is hospitalized for pneumonia. On the 10th hospital day she is found to have swelling and tenderness of her right leg, which has developed over the past 48 hours...
A.
Trousseau syndrome
B.
Protein C deficiency
C.
Immobilization
D.
Pregnancy
E.
Chronic alcohol abuse
查看完整题目与答案
【单选题】某女士，26岁，停经12周，阴道不规则流血12天，血中伴有小水泡物，暗红色。妇科检查：血压150/80mmHg，子宫前倾位，如孕4个月大，两侧附件可触及到鹅蛋大小、囊性、活动良好的肿块。本病例最可能的诊断是（ ）。
A.
先兆流产
B.
葡萄胎
C.
妊娠合并子宫肌瘤
D.
妊娠合并卵巢囊肿
E.
双胎妊娠
查看完整题目与答案
【单选题】妇女，26岁，停经12周，阴道不规则流血10余日，量不多.暗红色，伴有小水泡物。妇科检查：血压150/90mmHg，子宫前倾，如孕4个月大，两侧附件可触到鹅蛋大.囊性.活动良好.表面光滑的肿物。本病最可能的诊断是( )。
A.
双胎妊娠
B.
妊娠合并子宫肌瘤
C.
妊娠合并卵巢囊肿
D.
先兆流产
E.
葡萄胎
查看完整题目与答案
【单选题】Materials science remained empirical until the end of the _________ century when materials science, as we now understand it, began with the appearance of Mendeleev’s periodic table.
A.
17th
B.
18th
C.
19th
D.
20th
查看完整题目与答案
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