轴向位移增大的现象有哪些？
参考答案：
⑴轴向位移批示增大或信号装置报警。
⑵推力瓦块温度升高。
⑶差胀批示相应变化。
⑷机组振动增大，声音异常等。
— Why didn't you ask Jim to join us?
— It's between you and me. We must _____ anyone else from knowing our plans. [ ]
A. have
B. allow
C. keep
D. hear
思维的涉及面是指思维的（）。
A.深度
B.独立性
C.广度
D.灵活性
