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【单选题】
程序段G17 G16 G90 X100 Y30中,X指令是( )
A.
X 轴座标位置
B.
极半径
C.
旋转角度
D.
时间参数
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【简答题】非活性混合材料掺入硅酸盐水泥中可以起到的作用是( )、( )、( )。
【单选题】— It is unwise for some people to drive and talk on a cell phone. —_______. It’s very dangerous.
A.
I couldn’t agree more
B.
Not really
C.
Good idea
D.
That’s great
【单选题】听力原文:W: I've to go to Washington this afternoon, but I'm too tired to drive and the bus is so uncomfortable. M: No problem. I'll save you the cost of a taxi by dropping you off at the train station on...
A.
Riding.
B.
By bus.
C.
Driving.
【单选题】The _______ supports the diesel engine with hydraulic pumps for travel drive, vibration drive and steering ,and other parts of the vibratory rollers.
A.
articulated joint
B.
drive shaft
C.
front frame
D.
rear frame
【判断题】相互易位杂合体会产生败育的花粉,其原因是在性母细胞减数分裂的后期 I的相邻式分离,会形成和倒位杂合体相同的重复-缺失染色体。
A.
正确
B.
错误
【简答题】在一定条件下,NO跟NH 3 可以发生反应生成N 2 和H 2 O。现有NO和NH 3 的混合物1 mol,充分反应后所得产物中,若经还原得到的N2比经氧化得到的N 2 多1.4g。 ( 1 ) 写出反应的化学方程式并标出电子转移的方向和数目。 ( 2 ) 若以上反应进行完全,试计算原反应混合物中NO与NH 3 的物质的量可能各是多少。
【简答题】(8分)在一定条件下,NO跟NH 3 可发生反应:6NO+4NH 3 =5N 2 +6H 2 O。现有NO与NH 3 的混合物1mol,充分反应后所得产物中,经还原得到的N 2 比经氧化得到的N 2 多1.4g。 (1)标出电子转移的方向和数目。 (2)若以上反应进行完全,试计算反应混合物中NO与NH 3 的物质的量可能各是多少。
【简答题】阅读理解。 Mr Knott was a teacher. He taught in a big school in London. He lived a long way from the school, so he was usually quite tired when he got home. At nine o'clock one evening when he was in bed, ...
【判断题】相互易位杂合体会产生败育的花粉,其原因是在性母细胞减数分裂的后期I的相邻式分离,会形成和倒位杂合体相同的重复-缺失染色体。
A.
正确
B.
错误
【单选题】It looks as if it came straight from the set of Star Wars. It has four-wheel drive and rises a bove rocky surfaces. It lowers and raises its nose when going Up and down hills. And when it comes to a r...
A.
It swims.
B.
It raises its nose.
C.
It uses hydrojets.
D.
It uses its four-wheel drive.
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