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【判断题】
选择正面投影视图的时候,组合体的安放位置一般选择物体平稳时的位置
A.
正确
B.
错误
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举一反三
【单选题】单相交流电路的电压有效值为U,电流有效值为I,则视在功率S的表达式为______。
A.
UI
B.
UI
C.
UI
D.
UI
【单选题】对于早产极低体重儿预防肺透明膜病的有效措施是 :
A.
抗菌素
B.
正压给氧
C.
肾上腺皮质激素
D.
气管内滴入肺表面活性物质
E.
纠正酸中毒
【单选题】_ a little longer, but I really have to go now.
A.
I’d stay
B.
I’ll stay
C.
I can stay
D.
I’d have stayed
【单选题】Sorry, I am too busy now. If I _____ time, I would certainly go for an outing with you.
A.
have
B.
have had
C.
had had
D.
had
【单选题】—Would you like to go shopping with me? —Yes, I'd love to, but I'm _____ I have no time now. [     ]
A.
afraid
B.
kind
C.
happy
D.
glad
【单选题】—I'll have to go to the classroom. I left my MP5 player there just now. —You don't have to. I ________ it for you. Here you are. [     ]
A.
will bring
B.
bring
C.
brought
D.
have brought
【单选题】单相交流电路的电压有效值为U,电流有效值为I,则视在功率S的表达式为______。
A.
UI
B.
1/2UI
C.
(1/2)1/2UI
D.
21/2UI
【单选题】单相半波整流电路的交流电源电压有效值为U2,则输出电压的平均值是()。
A.
0.45U2
B.
0.9U2
C.
U2
D.
【单选题】临床上边缘性颌骨骨髓炎,常继发于
A.
颞间隙感染
B.
颊间隙感染
C.
咬肌间隙感染
D.
颌下间隙感染
E.
智齿冠周炎
【单选题】对于早产极低体重儿预防肺透明膜病的有效措施是
A.
抗菌素
B.
正压给氧
C.
肾上腺皮质激素
D.
气管内滴入肺表面活性物质
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