数控车床刀片或刀具()参数和切削参数要规范化、典型化。
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The () compressor and its electrical motor are entirely housed in a gas-tight casing.
A. open-type
B. hermetic
C. A and B
D. None of the above
在正常情况及相同负载下,下列哪种类型的执行机构动作较慢()。
A. 液动;
B. 气动;
C. 电动;
D. 无法判断。
Outstanding salespeople like Mrs. Love () helped make our company a leader in this field.
A. has
B. have
C. is
D. are
钻井泵缸套更换完毕,必须清理好拉杆箱内的手工具,()后再开泵。
A. 倒好上水管阀门
B. 关闭阀门
C. 关闭进水阀门
D. 关闭上水管阀门