【单选题】无线电波有四种,分别是中波、短波、超短波和微波.其中关于微波叙述正确的是()。
A.
沿地面传播,绕射能力强,适用于广播和海上通信
C.
具有极高频率的电磁波,波长很短,主要是直线传播,也可以从物体上得到反射
D.
和超短波一样饶射能力都很好,但不可作为视距或超视距中继通信
【单选题】Please choose the better one: (according to the principle of Correctness)
A.
This product is absolutely the best on the market.
B.
This product is the best one we can supply.
【多选题】关于述职报告的语言特点,下列说法正确的有( )
【单选题】[16-652]一般情况下,划分计算机四个发展阶段的主要依据是:
【单选题】For _____ homeless, private medical care is simply out of _____ question in some developing countries. [ ]
【单选题】Please choose the better one: (according to the principle of Courtesy)
A.
You are requested to send me a pricelist for your M-series.
B.
Would you please send me a pricelist for your M-series.