问题
单项选择题
造成水泥安定性不良的原因是水泥中含()量过高。
A.氢氧化钙
B.碳酸钙
C.游离氧化钙
D.二氧化硅
答案
参考答案:C
造成水泥安定性不良的原因是水泥中含()量过高。
A.氢氧化钙
B.碳酸钙
C.游离氧化钙
D.二氧化硅
参考答案:C
补全对话 从每题A、B、C、D中, 选出一个能够填入对话空白处的最佳选项。 A: Hey, John. B: Hi, Michael. A: 1 B: I’m reading a book. A: 2 I have got the latest movie video. Let’s watch it together. B: Great. Where is your house? A: 3 . There is a small bookstore at the crossing. I’ll meet you there. B: Oh, OK. 4 A: What about 2 pm? B: OK. By the way, I haven’t finished my homework yet and I have some problems with it. A: 5 We can do it together then.
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