( )是对特种设备的生产经营单位实施资格许可，并对部分产品出厂进行安全性能检验；

电气试验用仪表的准确度要求在（）级。

A、0．5；

B、1．0；

C、0．2；

D、1．5。

A: What’s the date today
B: It’s June 16.
A: (16) Then it’s Dragon Boat Festival today, isn’t it
B: Yes. (17)
A: Did you have rice dumplings this morning
B: Sure. (18)
A: I didn’t.
B: What a pity! But I happen to have got some with me. (19)
A: I’d love to. By the way, why do you call it Dragon Boat, Festival
B: Because in China, people race dragon boats this day every year.
A: Oh, I see. (20)
B: You are welcome.
A．We Chinese usually eat rice dumplings this day
B．I hate eating rice dumplings.
C．Thank you for your rice dumpling.
D．I don’t think so.
E．Would you like to have one
F．Already
G．How about you

下列关于图层蒙版的描述错误的是（）。

A、如果要隐藏当前图层，用黑色在蒙版中绘图

B、如果要显示当前图层，用黑色在蒙版中绘图

C、从编辑蒙版转换到编辑图层，单击图层控制面板中该图层的缩览图

D、如果要使当前图层部分可见，可在当前图层上添加渐变蒙版