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【单选题】
在环境污染物质中,一次污染物是指:A.
从污染物排入环境后,理化性质发生了改变的污染物
B.
从污染物直接排入环境后,理化性质未发生改变的污染物
C.
从污染物排入环境后,其毒性增大的污染物
D.
多个污染源同时排出的同一类污染物
E.
多种环境介质中都存在同一类污染物
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举一反三
【单选题】In CA6140, When the transmission route of the transverse feed is consistent with that of the longitudinal feed, ( )
A.
2f 横 =f 纵 .
B.
4f 横 =f 纵
C.
f 横 =2f 纵
D.
f 横 =4f 纵
【单选题】Which channel and mode should be used when initiating a distress alert transmission?（）
A.
Channel 6 DSC
B.
Channel 6 Radiotelephony
C.
Channel 13 Radiotelephony and channel 16 DSC
D.
Channel 70 DSC
【多选题】When we confirm a transmission scheme of the whole system, which parameters we could calculate?
A.
normal module of gears
B.
rotation speed
C.
I/O power
D.
torque of each shaft
【单选题】When the transmission of a radio station have broken down ,switched off or suspended, it is _____
A.
unfunctional
B.
break down
C.
off power
D.
off air
【单选题】下列关于卤代烃的叙述正确的是
A.
下列关于卤代烃的叙述正确的是
B.
．所有卤代烃在适当条件下都能发生消除反应
C.
所有卤代烃都含有卤原子
D.
所有卤代烃都是通过取代反应制得的
【单选题】The opens the starter circuit when the transmission is in any gear but neutral or park on automatic transmissions.
A.
battery
B.
neutral safety switch
C.
starter relay
D.
starter solenoid
【简答题】When a transmission is in direct drive, the engine and transmission turn at [1]____speed; override occurs when a driven gear turns [2]____ than its drive gear.
【单选题】This switch_____ the starter circuit when the transmission is in any gear but Neutral or Park on automatic transmissions
A.
closes
B.
cuts off
C.
on
D.
opens
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