在样本均数与总体均数比较时,若n=25,t=1.96,则()
A.P>0.05
B.P=0.05
C.P<0.05
D.P<0.01
E.P值无法确定
参考答案:A
When I got back home I saw a message pinned to the door ____"Sorry to miss you; will call later."[ ]
A. read
B. which reads
C. to read
D. reading
显微镜的镜头有灰尘时应()。
A、用手指擦镜头
B、用嘴吹
C、用布擦
D、用擦镜头纸擦镜头