一天早晨的气温是-5℃,中午上升了9℃,半夜又下降了7℃,请问的气温是多少度?
(-5)+(+9)+(-7)
=-5+9-7
=-12+9
=-3.
答:半夜的气温是-3℃.
— Can you explain ____ you have been late for school several times this term?
— Sorry, but it is the first time that I have been late this week.
A.why it is that
B.how it is that
C.why is it that
D.how is it that
诊断腹腔内脏损伤最有价值的方法是
A.超声波检查
B.腹腔穿刺腹腔灌洗术
C.腹部压痛
D.X线检查
E.同位素扫描