问题
单项选择题
启动密封油泵之前，反应系统压力应（）。
A、≥0.2MPa
B、≥0.4MPa
C、≥0.6MPa
D、≥0.8MPa
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
启动密封油泵之前，反应系统压力应（）。
A、≥0.2MPa
B、≥0.4MPa
C、≥0.6MPa
D、≥0.8MPa
参考答案：B
Passage Two
Which of the following is true according to what you’ve just heard
A．His horse flew over the treetops below.
B．His horse nearly fell into the deep valley.
C．His horse raced across the valley easily.
D．His horse refused to carry him over the hilltop.