The master got permission to pump out 500 tons of clean sea water for ().
A. the purpose of trimming
B. the approval for ballast
C. the purpose of voyage
D. the approval for operatio
从构词法角度看,“血红”是限定式,“口红”是陈述式。
A. 正确
B. 错误
电针电流的波型中,密波的频率为每秒____次,疏波的频率为每秒____次。
The sports meet originally due to be held last Friday()(最终因天气不好而取消了).