55._________A. noiseB. soundC. musicD. bell

The PRIMARY function of a waste heat boiler is to _____.A.reduce engine exhaust noiseB.red

回答（55）题 查看材料A.noiseB.sounDC.musiCD.bell

All the following can damage hearing EXCEPT______.A．excessive noiseB．too much moderate noi

While I _____ television, the door bell _____.A. watched／would ringB. would watch／h

____________, they immediately left the house.A、Being heard the noiseB、Hearing the noise

_______ had the bell rung _______ the students took their seats.A、No sooner;whenB、Hardly