×型腿见于
A．小儿麻痹症后遗症
B．佝偻病
C．股骨头无菌性坏死
D．膝关节结核
E．髋关节脱位
参考答案：B
People ________do exercise every day have a better chance of staying healthy than those ________don’t.
A．who; /
B．/; who
C．who; who
D．/; /
欧姆定律是电路中（）、电流和电压的关系定律。
A.电流
B.电阻
C.电功
D.电功率
