用坩埚炉可熔炼()。
A.铸铁
B.铝
C.铜
D.铅
E.钢
参考答案:B, C, D
— you take a bus to school?
—Yes. But now I usually go to school on foot.[ ]
A. Did; use to
B. Were; used to
C. Do; use to
D. Will; use to
患者,女性,28岁,停经4个月,检查子宫体大于停经月份。为鉴别正常妊娠、多胎妊娠或异位妊娠,最佳的方法是()。
A.超声多普勒
B.AFP
C.B超
D.腹部X线拍片
E.胎儿心电图