一对齿轮啮合传动，只要其压力角相等，就可以正确啮合。
参考答案：错
3．_________last year, the number of people traveling this holiday weekend is expected to increase slightly.
A．Being compared to
B．Comparing to
C．Compared with
D．Comparing with
灌注水下混凝土有哪些方法，桥梁工程中常采用哪种方法？
