当车床发出异响时能否继续工作?为什么?
参考答案:不能,车床发出异响出现机械故障时会使车床的安全系数降低,增加作业风险。
—Is this black pen _______?
—No. It belongs to _______. [ ]
A. yours; me
B. yours; his
C. her; him
D. yours ;her
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