【判断题】在共射放大电路中,如果静态工作点设置过高,电路会产生饱和失真。
【单选题】Beef is healthy ______ and juice is a healthy ______ . [ ]
【判断题】离心式鼓风机主要结构和工作原理与离心式通风机类似,单级叶轮所产生的压头很低,故一般采用多级叶轮
【简答题】They are now_______ (准备) food and drink for the party.
【单选题】Which of the following policies is NOT included in the British foreign trade policies?
A.
Generally, it has been adopting free trade policy.
B.
There are 7 free trade zones, where the government allows goods to be stored for shipment without tariffs or import duties.
C.
The government tends to have free trade policies for competitive enterprises in the UK.
D.
The government tends to have protective trade policies for foreign-market-oriented enterprises in the UK.
【简答题】What is the total budget for food and drink per person?
【判断题】离心式通风机与水泵的工作原理相似( )。
【判断题】离心式通风机 结构和工作原理与离心泵相似,在蜗壳中有一高速旋转的叶轮,借叶轮旋转时所产生的离心力将气体压力增大而排出。