听力原文:M: I've had enough of this museum. Why don't we skip the gift shop?
W: Look. We promised my brother the poster so we haven't much choice.
Q: What does the woman imply?
(19)
A.There are many gifts to choose from.
B.She wants the man to buy the poster for her.
C.They promised to stop at the shop.
D.They must buy something for her brother.
第2题
关于锅炉酸洗,下列说法正确的是_________。
A.酸洗过程中锅炉应周期性地点火加热
B.酸洗完应监测腐蚀指示片的腐蚀量
C.酸溶液中添加缓蚀剂可保护锅炉不腐蚀
D.酸洗间隔不少于1年
第3题
锅炉在进行酸洗时,为了防止酸对金属的腐蚀,必须添加合适的()。
A.酸洗剂
B.缓蚀剂
C.漂洗剂
D.钝化剂
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