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问题 选择题
某同学安装电路时，想用一个开关同时控制两盏电灯的发光和熄灭，下列各种设计方法中正确的是（　　）

A．只能将两盏灯并联

B．只能将两盏灯串联

C．两盏灯可以是串联，也可以是并联

D．以上说法都不正确

答案

答案：C

单项选择题

A local elementary school has requested scoliosis screening for its students from the hospital’s community outreach program. The school should be informed that

A. these students are too young to screen; instead, older students should be screened.
B. these students are too old to screen and will no longer benefit from screening for scoliosis.
C. scoliosis screening requires sophisticated equipment and can’t be done in school.
D. this is an appropriate request and arrangements will be made as soon as possibl
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判断题

共用剃须刀有传染艾滋病的危险。（）
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