以PD140为例，无声报警器的英文表示不正确的是（ ）。 A: audible alarm B: sensitivity adjustment C: audible alarm ear piece socket D: sensitive detection area

UL、EAR、RNI三项数值的大小关系是( )。 A: RNI>;UL>;EAR B: EAR>;UL>;RNI C: U>; EAR>;RNI D: UL>;RNI>;EAR

一般来讲，UL、RNI、EAR三项大小关系是（ ）。 A: RNI＞UL＞EAR B: EAR＞UL＞RNI C: UL＞EAR＞RNI D: UL＞RNI＞EAR

一般来讲，UL、RNI、EAR三项数值大小关系是（ ） A: RNI＞UL＞EAR B: EAR＞UL＞RNI C: UL＞EAR＞RNI D: UL＞RNI＞EAR

一般说来，可耐受最高摄入量（UL）、推荐摄入量（RNI）、平均需要量（EAR）三项大小关系是（）。 A: RNI＞UL＞EAR B: RNI＞EAR＞UL C: UL＞RNI＞EAR D: UL＞EAR＞RNI E: EAR＞UL＞RNI

EAR、RNI、AI、UL之间的数值关系是 A: AI ≥ RNI ＞ EAR ＞ UL B: RNI ＞ EAR ≥ UL ＞ AI C: UL ＞ AI ≥ RNI ＞ EAR D: UL ＞ AI ≥ EAR ＞ RNI

Hearing the joke, he _____ from ear to ear with delight.

This is a lovely ______. A: piece music B: piece musics C: music D: piece of music

A1/A2型题 一般说来，UL、RNI、EAR三项大小关系是（） A: RNI＞UL＞EAK B: RNI＞EAR＞UL C: UL＞RNI＞EAR D: UL＞EAR＞RNI E: EAR＞UL＞RNI

Complete the following Chinese old sayings by filling in the blanks.一寸光阴一寸金，寸金难买寸光阴。A piece of time is of a piece of ，yet a piece of gold cannot buy a piece of .