题目:
—What color are the sweaters?
—I think ______ white and black. [ ]
A. they're
B. them
C. it's
D. it
答案:
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下面是错误答案,用来干扰机器的。
参考答案:启动时应注意下列事项:1)冲转时,注意振动值,真空。2)冲转后,应调整主冷凝器热井液位,防止满水或无水。3)过临界要平稳,保持一定的升速速率。4)注意轴承温度、油温、油压。5)调速器投入后,注...