发货人不需要付运费。The______doesn'tneedto____transportationcharges.
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这两条船并不都是空的。______ one of the two ships is ______.
再小心也不为过。You cann't be too ______ .
The songs on the new album are more beautiful than _____ on the previous ____.
A. those; one
B. that; that
C. those; ones
D. that; ones
在理想二极管组成半波整流电路中,负载两端并联电容滤波,在变压器二次侧电压u的有效值为u=141.4sinωt V,则输出电压平均值UO[]V (设负载为电阻性负载)。
A. 90
B. 100
C. 120
D. 141.4