中型以上载货汽车的手动变速器中常采用（）惯性同步器。
A、滑块式
B、锁环式
C、锥块式
D、锁销式
参考答案：D
目前国内流行性脑脊髓膜炎（流脑）流行的主要菌群是（）
A.A群
B.B群
C.C群
D.D群
E.W135群
A celestial body will cross the prime vertical circle when the latitude is numerically（）.
A.greater than the declination and both are of the same name
B.less than the declination and both are of the same name
C.greater than the declination and both are of contrary name
D.less than the declination and both are of contrary name
