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【单选题】
下列关于图层的叙述中,正确的是A.
对于一个包含有多图层的文档来说，至少可见到一个图层中的对象内容
B.
可能通过单击图层面板中的某-个按来直接创建一个遮罩层
C.
能够实现多个图层共享一个引导层
D.
锁定图层后，该层中的对象便变成是不可见的
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【简答题】8051单片机内部有两个______位定时器/计数器，可完成______功能。
【简答题】用单片机和内部定时器产生方矩形波,要求频率为 100Hz ,占空比 2:1 ,设单片机频率 12MHz
【简答题】I'd say there are two ways we could deal with this. ________ 2. We could have a chat with him about his sales reports. ________ 3. If we take a firm approach, there's a risk he may get upset a...
【单选题】I've lost the telephone number of my friend Jane. I had written it down. [ ]
A.
Only if
B.
If only
C.
Only
D.
If
【简答题】Jane is the only girl who ______ (keep) short hair in our class now.
【单选题】The success of Jane Eyre is not only because of its sharp criticism of the existing society, but also due to its introduction to the English novel the first______heroine.
A.
explorer
B.
peasant
C.
worker
D.
governess
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