问题
选择题
Lily is a good student. She late for school.[ ]
A. is hardly ever
B. isn't never
C. is often
D. is always
答案
答案：A
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Lily is a good student. She late for school.[ ]
A. is hardly ever
B. isn't never
C. is often
D. is always
答案：A
某车间需要用一台车床和一台铣床加工A、B、C、D4个零件。每个零件都需要先用车床加工，再用铣床加工。车床与铣床加工每个零件所需的工时(包括加工前的准备时间及加工后的处理时间)如表5-3所示。
| 表5-3 加工每个零件所需的工时
|
A．25
B．26
C．27
D．28