龈下菌斑主要为（）。 A.革兰阴性厌氧者 B.革兰阳性球菌 C.需菌 D.衣原体 E

根据句意及汉语提示，在空格中填入正确的单词。每空限填一词。

1. There is no _______ (怀疑) that computers are very useful.

2. _______ (尽管) Jim's uncle is old, he looks very strong and healthy.

3. Do you learn anything else _______ (除了) Chinese at school?

4. —We know several _______ (方法) of English learning from this passage. 

    —Remember to choose one that fits you best.

5. Can you _______ (翻译) this English sentence into Chinese?

6. With his friends' help, he _______ (成功) at last.

7. Do you know that the population of India is _______ (更多) than that of America?

如图所示，轻弹簧的一端悬挂于O点，另一端与小球P相连接，将P提起使弹簧处于水平位置且无形变，然后自由释放小球，让它自由摆下，在小球摆到最低点的过程中

A．小球的机械能守恒

B．小球的动能增加

C．小球的机械能减少

D．不能确定小球的机械能是否守恒

硝酸甘油不扩张下列哪类血管

A．小动脉
B．小静脉
C．冠状动脉的输送血管
D．冠状动脉的侧支血管
E．冠状动脉的小阻力血管

热邪壅肺证，可见

A．咳嗽，咳痰稀白
B．咳嗽，痰多泡沫
C．咳喘，咳痰黄稠
D．咳嗽，痰少难咳且咳喘
E．痰多易咳

CRH1司机室操纵台上的停放制动状态指示灯闪烁表示（）。

A、停放制动正在动作

B、停放制动被切除

C、停放制动未施加

D、停放制动已施加