A vessel emitting harmful substances into the air or spilling oil into the sea is __（）

A.Polluter

B.Emitter

C.Spiller

D.Oiler

A.equipping

B.evolving

C.evaporating

D.emitting

A.filling

B.emitting

C.polluting

D.wasting

A.Emitting

B.Imaging

C.Imitating

D.Immigrating

A.polluting

B.filling

C.emitting

D.wasting

A.giving out

B.emitting

C.sending

D.spreading

A. filling

B. emitting

C. wasting

D. polluting

When an auxiliary boiler is panting and emitting(发出) black smoke, you should______.

A.increase the fuel oil temperature

B.decrease the fuel oil temperature

C.decrease the fuel oil supply pressure

D.increase the air supply

A.VHF1系统故障

B.VHF1系统在发射方式超过60秒

C.VHF1系统天线故障

D.VHF1收发机在接收方式超过60秒

A.单模光纤的纤芯大，多模光纤的纤芯小

B.单模光纤比多模光纤采用的波长长

C.单模光纤的传输频带窄，而多模光纤的传输频带宽

D.单模光纤的光源采用发光二极管（Light Emitting Diode），而多模光纤的光源采用激光二极管（Laser Diode）