在小数部分，每相邻两个计数单位间的进率都是[ ]
A．1
B．0.1
C．10
D．100
答案：C
---______ are you buying so much food?
---Because your uncle is coming for supper.
A．What
B．How
C．Where
D．Why
一般标准斜齿条的端面压力角为200.
