The good news made us _____ very happy. [ ]
A. feel
B. to feel
C. felt
D. feeling
答案:A
两根相同规格型号的电缆,其长度大者电阻()。
A、大
B、小
C、与短者相同
通过电话或信函调查,易发生()
A.无应答偏倚
B.失访偏倚
C.选择偏倚
D.混杂偏倚
E.领先时间偏倚