汽车总的重量不超过5吨,若用g表示汽车重量,则g______5.
g≤5.
It is good news to us that we are invited to such a great concert, _____?
[ ]
A. is it
B. isn't it
C. are we
D. aren't we
伤寒第3~4周时阳性率最高的是
A.骨髓培养B.血培养C.尿培养D.粪便培养E.肥达反应