— _____________ flowers are there?
— There are ten.[ ]
A. How much
B. How many
答案:B
用锡纸卸甲时,应将手指包上锡纸,裹紧十个指甲()分钟。
A、5
B、10-20
C、30
D、15-20
电连接根据安装位置分为哪几种?