If our government attention to controlling food safety now, our health ________ in danger.
A:won't pay; is
B:doesn't pay; is
C:won't pay; will be
D:doesn't pay; will be
要想使 a13 是假分数, a14 是真分数,a是____.
如图,在直角∠O的内部有一滑动杆AB,当端点A沿直线AO向下滑动时,端点B会随之自动地沿直线OB向左滑动,如果滑动杆从图中AB处滑动到A′B′处,那么滑动杆的中点C所经过的路径是( )
阅读下面的英国农业人口占劳动力人口的比重变化表。这一变化可以说明( )
年份
比重
1840
22.7
1860
18.7
1890
10.2
1900
8.4