坯料的加热目的是提高其变形抗力,提高金属塑性,使之易于在模膛内流动成行,并具有一定的力学性能。
参考答案:错
选择正确的词填空。
1. She has three __________. ( photos / photoes )
2. Tom __________ very hard. (study / studies)
3. Mary can swim __________. (good / well)
4. Are these baseballs? Yes, __________ are. (they / these)
5. Jet Li is in the movie. __________ movie is exciting. (His / He)
一般光缆线路的施工程序,可以划分为()、敷设、接续、()和竣工验收五个阶段。