问题
单项选择题
水嘴放出的水白浊而不消失，或经煮沸后发生白浊这是因为（）。
A、水中含有碳酸盐
B、水具有腐蚀性，使管道的铁溶于水中
C、水具有腐蚀性，使镀锌管的锌溶于水中
D、水的碱度太高
答案
参考答案：C
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水嘴放出的水白浊而不消失，或经煮沸后发生白浊这是因为（）。
A、水中含有碳酸盐
B、水具有腐蚀性，使管道的铁溶于水中
C、水具有腐蚀性，使镀锌管的锌溶于水中
D、水的碱度太高
参考答案：C
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| Eating in western restaurants is a little different from eating in Chinese ones. It is 1 to understand the differences and to act 2 . As they say "When in Rome, do as the Romans do." When you first 3 the restaurant, you should wait for the waiter to show you to a table. Sometimes it is all right to find a table for yourself, but you should ask 4 . In a western restaurant, people usually ask for their own food or dishes and eat 5 they ask for. Western people don't put all of the food in the middle of the table to 6 together. One of the 7 differences between Chinese restaurants and western ones is that most Chinese restaurants aren't 8 , but in most western restaurants people there speak in a low voice. Don't shout to the waiters, 9 people may think that you are impolite. If you need help, you should try to ask with your eyes 10 your voice. It's better not to put up your hand, either. | |||
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