以茶待客是中国人的传统习惯,待客的第三杯茶有什么含义?
查看答案
造成省煤气管泄露的主要原因是氧腐蚀和外部腐蚀。
A. 正确
B. 错误
当今世界上流行着一个()的国际标准,简称为TPO原则。
A. 色彩协调
B. 搭配协调
C. 着装协调
D. 款式协调
Which is the correct procedure for anchoring a small to medium size vessel in deep water ().
A. Let the anchor fall free from the hawsepipe,but apply the brake at intervals to check the rate of fall
Back the anchor slowly out of the hawsepipe a few feet,and then let it fall in the normal fashion
C. Let the anchor fall off the brake right from the hawsepipe,but keep a slight strain on the brake
D. Under power,back the anchor out until it is near,but clear,of the bottom before letting it fall
DEH控制系统中,由LVDT(差动变压器)输出的调门阀位信号可直接被阀门控制器所使用。
A. 正确
B. 错误