This is ____________ skin. [ ]
A. a
B. /
答案：B
With the great weight ______ off her mind, she passed the test successfully. [ ]
A. taking
B. taken
C. take
D. to be taken
在S7-200系列PLC中，下列定时器的分辨率为100ms的有（）
A.T1
B.T31
C.T61
D.T91
E.T100
