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【单选题】
对有红外线和紫外线及应用激光的场所应采取的措施不包括()。
【判断题】
红外辐射即红外线,也称热射线,波长0.5pm~8mm。( )
【单选题】
紫外线波长为7.6~400nm。凡是物体温度达到1200℃以上时,辐射光谱中即可出现紫外线,物体温度越高,紫外线的波长越短,强度也越大。( )
【单选题】
使用紫外线灯消毒时紫外线强度不低于()
【单选题】
以下职业病不是由于电离辐射导致的包括( )。
【单选题】
The manager______ at 8:30 am for the meeting, but he didn’t show up.
④
was supposed to arrived
【单选题】
If Linda had practised hard enough last week,she______ more confident on the stage now.
【单选题】
Theyareconsidering______beforethepricesgoup.
【单选题】
After the student was praised for what he had done, he said:“ I______ even better under harder conditions. ”
【单选题】
The old man is upset in fact today, but he looks as if he______ as happy as before.
【单选题】
Thechildrenwenttheretowatchtheirontower________.
【单选题】
The Bakers arrived last night. If they’d only let us know earlier,______at the airport.
【单选题】
It is said that people can ______ or deposit money from bank through facial recognition, ie, they don’t have to use a bank card.
【单选题】
In the month, the man earned as much as, if______ than $50,000.
【单选题】
—Why didn’t you come to join her party?
—I______, but I had to look after my ill mother.