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【多选题】
下列物质中,既是质子酸,又是质子碱的是( )。A.
NH 4 +
B.
HS -
C.
PO 4 3-
D.
HCO 3 -
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举一反三
【单选题】患者，女，21岁，左耳搏动性耳鸣1年余，伴听力下降，无头痛、耳漏、眩晕、恶心、呕吐等。检查见双耳外耳道正常，右耳鼓膜正常，左耳鼓膜膨隆且前下方可见红色影。纯音测听示左耳中重度混合性聋。上述病史与以下哪种疾病的临床表现最为相符（）
A.
梅尼埃病
B.
颈静脉球体瘤
C.
颈动脉体瘤
D.
中耳胆脂瘤
E.
耳硬化症
F.
中耳癌
G.
听神经瘤
【简答题】To help raise the public's awareness of the suicide problem, psychiatrist Tiller appealed to the government to organize ______ .
【单选题】某企业有5条产品线，它们的产品项目数分别是4、 7、6、5、2，那么该企业的产品组合的 宽度和长度分别为()
A.
5,7
B.
11.13
C.
5,11
D.
5，24
【单选题】Market incentives are useful in that they help ______.
A.
raise commodity prices to give government a bigger revenue
B.
the government encourage more researchers to make technological innovations
C.
raise oil prices to cut gasoline consumption and protect our environment
D.
the government give allowances to private enterprises to build more advanced highways
【简答题】活塞销与销座及连杆小头的配合有 及 二种形式
【单选题】The students in Class 3 planned to sell old books to _______ money to help the new student.
A.
raise
B.
rise
C.
make
D.
save
【单选题】Market incentives are useful in that they _____.
A.
help raise commodity prices to give government a bigger revenue.
B.
help the government encourage more researchers to make technological innovations.
C.
help raise oil prices so as to cut gasoline consumption and Protect our environment.
D.
help the government give subsidies to private enterprises to build more advanced highways.
【简答题】调整图片色彩偏向的命令是
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