肠梗阻的临床症状不包括()。
A.腹痛
B.呕吐
C.板状腹
D.腹胀
E.停止排便排气
参考答案:C
解析:肠梗阻四大症状指腹痛、呕吐、腹胀、停止排便排气四大症状。
变速箱齿轮齿面渗碳层剥落轻微时,可用()将剥落处的锐边磨圆,继续使用;剥落严重时,应更换。
A、挫刀
B、油石
C、砂轮
D、砂纸
You can indicate that your vessel is in distress by().
A.displaying a large red flag
B.displaying three black balls in a vertical line
C.sounding four or more short rapid blasts on the whistle
D.continuously sounding the fog whistle