V带传动中,为增大带与带轮的摩擦,包角越小越好。
参考答案:错
You should help others out as ______ as ______. [ ]
A. often, you can
B. seldom, you can
C. often, you could
配置标准溶液一般有哪些方法()
A、直接法
B、间接法
C、摩尔法
D、重量法