安装后的工艺管道，应根据使用要求进行清洗，清洗完毕排放水应引入指定地点，排水时应注意不得形成( )。
A．低压
B．高压
C．正压
D．负压
参考答案：D
Managers in excellent companies have a strong _____ for doing things rather than talking about situations.
A．opinion
B．feeling
C．idea
D．preference
（）is measured from the baseline to the summer loadline at the midship section.
A.Extreme draft
B.Molded draft
C.Extreme depth
D.Molded depth
