导通性检测时如果电阻值小于()欧姆,万用表将发出蜂鸣声。如果存在开路,万用表不会发出蜂鸣声。
A.10
B.50
C.150
D.300
参考答案:C
— _____ people are taking action to protect the environment now.
— Yes. _____ of my classmates come to school by bike now. [ ]
A. More and more, Four fifth
B. Less and less, Four fifth
C. More and more, Four fifths
D. Less and less, Four fifths
易于引起高钙血症的肺癌是()。
A.类癌
B.腺癌
C.燕麦细胞癌
D.鳞癌
E.大细胞癌