钢材锈蚀的主要影响因素有（）、侵蚀性介质数量、钢材材质汉表面状况等。
A.环境温度
B.风速
C.气压
D.环境湿度
参考答案：D
The couple offered to ________ my house while I was on holiday in Hawaii, which was really kind of them..
A．look over
B．take over
C．hand over
D．watch over
少先队员的标志是（）。
A.队旗
B.红领巾
C.星星火炬
