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问题 多项选择题

影响凝汽器最有利真空的主要因素有（）

A.进入凝汽器的蒸汽流量

B.汽轮机排汽压力

C.冷却水的进口温度

D.循环水量（或是循环水泵的运行台数）

答案

参考答案：A, B, C, D

填空题

用括号内动词的适当形式填空。

     Last month, Tony ___1__ (have) a very busy weekend. On Saturday morning, he __2___ (clean) his room. In the afternoon, he __3____(do) his homework. It__4___ (be) very easy, so it ___5__ (take) him only half an hour. In the evening, he __6__(visit) his friends, he __7__ (have) a good supper that evening. On Sunday morning, he __8___(get) up very late. Then he __9___(read) a book about Chinese history. In the afternoon, he __10__ (go) to see an interesting movie
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多项选择题

网络资源的基本特点是（）。

A.权威与准确性

B.分散与无序性

C.广泛与经济性

D.丰富与新颖性
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