已知L1=85dB,L2=85dB,则合成声压级L1+2是()dB。
A.86
B.87
C.88
D.90
参考答案:C
根据句意及首字母提示或单词的适当形式完成句子。
1. —I often make m _______ in the English compositions.
—You should keep writing English diaries everyday.
2. She had difficulty f _______ this work. It was too much for her.
3. —Can you p_______this word?
—Sorry , I can't.
4. Don't forget _______ ( have) a math exam tomorrow.
5. Don't run so quickly. Please walk here s_______.
6. He has some problems ________(work) out the math problem.
7. The boy enjoys _______( memorize) the words of pop songs.
8. _______( give) it up would be like saying goodbye to an old friend.
工程建设其他费用中,与未来企业生产和经营活动有关的是:(2011,3)
A.建设管理费
B.勘察设计费
C.工程保险费
D.联合试运转费