在环境噪声评价量中“WECPNL”符号表示( )。
A.计权声功率级
B.声功率级
C.计权等效连续感觉噪声级
D.等效连续A声级
参考答案:C
在鼻腔的血液供应中,鼻腭动脉为哪一动脉的分支()
A.眼动脉
B.筛前动脉
C.上颌动脉
D.蝶腭动脉
E.眶下动脉
The major problem with E-mail is that it is (71) easy to use that people can become (72) with messages (73) they can possibly answer in a day. In addition, mail boxes require some management to (74) messages or archive those that might be required later. Senders don’t always know about your E-mail backlog and often send (75) messages.
A.too
B.so
C.very
D.much