感染了传染病病原体但无明显临床症状而排出病原体者称（） A.传染病患者 B.病原携带

左心衰竭心功能变化的指标是（）。

A.A

B.B

C.C

D.D

E.E

设某斗容量1.5m的正铲挖土机，挖4类土，深度在3立方米内，机械台班产量为5立方米，与之配合的工人小组由4人组成，则单位产品的人工时间定额为（）工日。

A.0.75

B.0.80

C.1.00

D.1.25

卵母细胞完成第二次成熟分裂是在：

A．卵泡生长发育时期

B．排卵前48小时

C．排卵时

D．排卵后48小时

E．与精子相遇受精时

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the (1) between sending the notification and notification arriving at the source, thousands of additional (2) may arrive. In ATM network, a major tool for preventing (3) is (4) control. When a host wants a new virtual (5) , it must describe the traffic to be offered and the service expected.

2（）

A．packets

B．cells

C．message

D．files

下列哪穴不在入前发际0.5寸处（）

A.上星

B.本神

C.眉冲

D.曲差

E.头临泣