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【单选题】
1990 年开始第六代数控的特征是采用( )。A.
大规模集成电路的小型通用电子计算机数控系统
B.
微型计算机控制的系统
C.
小、中规模集成电路的硬件数控系统
D.
工控PC机的通用CNC系统
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【简答题】阅读理解。 Drinking water is good for your health. There are some scientific ways of drinking water. 1. It is the best medicine to drink two glasses of water in the morning. 2. Drink clean water. 3. Drink ...
【单选题】It's important ______ a lot of water when you have a cold. [ ]
A.
to drink
B.
drink
C.
drinking
D.
for drinking
【单选题】— Sally, have you finished the project? — Not yet. — You've failed to do what you _____. Aren't you afraid your teacher will blame you? [ ]
A.
expected to
B.
were expected to
C.
will expect
D.
are expected
【单选题】v11接0.2 V的情况下，用万用电表测量图2.1的v12端得到的电压为多少？图中的与非门为74系列的TTL电路，万用电表使用5V量程，内阻为20kΩ/V。【图片】
A.
0.2V
B.
1.4V
C.
3.4V
D.
5V
【单选题】v11接0.2 V的情况下，用万用电表测量下图的v12端得到的电压为多少？图中的与非门为74系列的TTL电路，万用电表使用5V量程，内阻为20kΩ/V。【图片】
A.
0.2V
B.
1.4V
C.
3.4V
D.
5V
【单选题】We _______ work very quickly.
A.
don’t need
B.
needn’t to
C.
need not to
D.
don’t need to
【单选题】____ enough water every day is a wonderful way to keep us in good health. [ ]
A.
Drink
B.
Drinking
C.
Drunk
D.
To drink
【单选题】We don’t need heating system, ________.
A.
and nor we can afford it
B.
we don’t afford it
C.
nor can we afford it
D.
nor can’t it afford
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