What would you like? [ ]
A. I'd like some beef.
B. Let me try.
C. Help yourself.
答案:A
(1)(3分)如图螺旋测微器的读数为:
敷设电缆时,路径选择原则是()。
A.投资少
B.距离短
D.拐弯少
D.以上都包括