什么原因使运行中的TA发生不正常音响？
A coastal current（）. is generated by waves striking the beach。 flows outside the surf zone。 flows in a circular pattern。 is also known as a longshore current。
The（） should be shut once upon FWE. fuel oil。 cooling water。 air compressor。 auxiliary blower。
A backlash below a lock is defined as（）. a current setting your vessel on the wall。 a current setting into the lock chamber。 an eddy working along the lower guide wall。 a current setting counterclockwise。
The （）should be kept running for about half an hour after FWE. crankcase lubricating oil pump。 fuel oil pump。 air compressor。 auxiliary blower。
下列选项中属于小学语文教学的基本原则的是（）
