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【简答题】
把下面的六个图形分为两类，使每一类图形都有各自的共同特征或规律，分类正确的一项是：
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皮皮学刷刷变学霸
举一反三
【单选题】On the development of the electro-car, the main problem is ______.
A.
nothing technical
B.
electricity is too expensive
C.
the speed of the car is not fast enough
D.
the weight of the battery
【简答题】《巴塞尔公约》是关于什么的公约?
【单选题】When there is no movement of the rams on an electro-hydraulic steering gear, the tilting box of the running pump is _____.
A.
set for maximum torque
B.
on the purge and vent stroke
C.
in the neutral position
D.
rotating backwards
【单选题】Why does the writer of the letter that Electro-Robo is violent?
A.
It is control to radio water.
B.
It is expensive to buy.
C.
It is 80 centimeter
D.
It bears arms.
【单选题】巴塞尔公约是关于什么的公约?
A.
关于消耗臭氧层物质的国际公约
B.
关于化学品国际贸易资料交换的国际公约
C.
关于在国际贸易中对某些危险化学品和农药采用事先知情同意程序的国际公约
D.
关于控制危险废物越境转移及其处置的国际公约。
【单选题】Dual electro-hydraulic steering units usually operate ______．
A.
With both pumps on line at the same time
B.
With one pump on standby
C.
With the follow-up gear disconnected
D.
Only when the rudder is moved amidships
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