科研项目课题组长必须由能保证（ ）以上全时率的技术骨干担任。课题组长一般不得更换，确

具有健脾补中，升阳举陷，益卫固表，托毒生肌，利水消肿功效的药物是（）

A.人参

B.西洋参

C.党参

D.太子参

E.黄芪

由脾虚不运致痰湿停积的证侯属

A．因虚致实 

B．虚中挟实 

C．实中挟虚 

D．由实致虚 

E．虚实并重 

Why have the Americans developed space shuttle according to the passage

Which of the following statements is NOT true according to the passage

A．The term "averted vision" refers to the act of looking out of the comers of one’s eyes.
B．If you want to see very faint things, you should better look sideways rather than straight on.
C．The receptors located in the eye’s center are less sensitive to dim light.
D．To "look" is to see something straight ahead.

8155是一个可编程I/O接口芯片，以下说法正确的是（）。

A.有14位可控定时器/计数器。

B.芯片内包含有512个字节的RAM存储器。

C.控制命令寄存器和状态寄存器具有不同的地址编码。

D.80C51可以和8155直接连接