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【多选题】
一个单片机应用系统用LED数码管显示字符"8"的段码是80H,可以断定该显示系统用的是 。A.
不加反相驱动的共阴极数码管
B.
不加反相驱动的共阳极数码管
C.
加反相驱动的共阳极数码管
D.
加反相驱动的共阴极数码管
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皮皮学刷刷变学霸
举一反三
【简答题】在整车维护过程中,是通过检查____来检查发动机机油的容量。
【单选题】若把江河湖泊水中溶解的气体收集起来，分析的结果是：氧气所占的体积大于21%，氮气所占的体积小于78%，对此应得出的结论正确的是 [ ]
A.
只有空气中的氧气和氮气能溶解在天然水中
B.
溶解在天然水中氧气和氮气与空气中的氧气和氮气的百分含量相同
C.
天然水中溶解的氧气极少，所以在湖泊中养鱼要采取增氧措施
D.
氧气和氮气相比较，氧气比氮气更易溶解于水
【单选题】“ You ’ ve already got well, haven ’ t you? ” she asked. She asked ________.
A.
if I have already got well, hadn ’ t you
B.
whether I had already got well.
C.
h ave I already got well
D.
had I already got well
【单选题】Look what you've done! You _______ more careful.
A.
should have been
B.
should be
C.
had to be
D.
must be
【简答题】在整车维护过程中，需要对车辆底盘进行维护保养，是通过把车辆举起来进行维护作业。
【单选题】You want a colleague to look at a report you've written. You attach it to your email and write: __
A.
Can you take a quick look at ... for me, please?
B.
Please would you read the attached?
【单选题】When you’ve finished with that book, don’t forget to put it back on the shelf, ______________ ?
A.
do you
B.
don’t you
C.
will you
D.
won’t you
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