不能施焊的环境有（）。
A.雨、雪环境
B.气温35度以上
C.相对湿度大于50%
D.相对湿度大于90%
参考答案：A, D
Husband-and-wife team Zhao Hongbo and Shen Xue a gold medal at figure skating in the Winter
Olympics in Vancouver (温哥华). [ ]
A.beat
B.won
C.took
D.broke
预塔、加压塔、常压塔的压力是如何控制的？
