问题
单项选择题
锡基和铅基钎料属于（）钎料。
A.软
B.硬
C.难熔
D.超硬
答案
参考答案：A
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锡基和铅基钎料属于（）钎料。
A.软
B.硬
C.难熔
D.超硬
参考答案：A
阅读下面的短文，掌握其大意，然后从各题所给的四个选项中选出一个最佳答案。 Many children act in TV shows. They work several hours every day, _____ they can't go to regular _____. How do they get their schooling? In Hollywood, about forty ______ give lessons for the children. Their work is very ______. They make sure that the child ______ many different subjects. They make sure, ______, that the child gets enough _____ and play. Children in Hollywood must attend classes twenty _______ each week. If not, they can't _______ in TV shows any longer. TV children are usually ______ pupils, and most of their teachers ______ this kind of work. They give the pupils ______ in many interesting _______. Sometimes the “classroom” is a Mississippi _____. Sometimes it is the inside of a spaceship. Often the pupils become ______ stars.
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