用塞尺测量间隙时,可同时进行几片测量,一般控制在()片以内
A.2~3
B.3~4
C.4~5
D.5~6
参考答案:B
已知直角三角形中30°角所对的直角边为2㎝,则斜边的长为( )。
A. 2 ㎝
B. 4 ㎝
C. 6 ㎝
D. 8㎝
The moon light is coming in _____ the window and the room seems quiet and beautiful. [ ]
A. across
B. through
C. over