计算机网络应具有以下哪几个特征（）a.网络上各计算机具有独立的地理上是分散的b.各计

-Look! The bus is coming.

-But it's full of people. We can't __________ it.[ ]

A. get off

B. get down

C. get on with

D. get on

Don’t be too rude to your father. Never in his life _____ in that way.

A．has he spoken to

B．he has spoken to

C．has he been spoken to

D．he has been spoken

避免儿童青少年“移情”咨询者，遵循了心理咨询的哪条原则（）

A.保密的有原则

B.限时的原则

C.自愿的原则

D.情感自限的原则

E.延期决定的原则

脓血便见于

A．痔疮
B．消化道出血
C．阻塞性黄疸
D．阿米巴痢疾
E．过敏性肠炎

营养监测的主要功能包括（）。

A、可直接判定营养素的摄入水平

B、监测变化

C、发现趋势

D、仅能够对孕妇的营养水平作出监测

E、预测变化