已知d=18分米,求圆的面积,
3.14×(18÷2)2=254.34(平方分米)
It sounds like something is wrong with the car’s engine. , we’d better take it to the garage immediately.
A.Otherwise
B.If not
C.But for that
D.If so
鼠疫耶尔森菌的理化特征包括()
A.鼠疫耶尔森菌为两端钝圆,两极浓染的椭圆形小杆菌
B.革兰染色阴性
C.无鞭毛,有芽胞,能活动
D.对外界抵抗力较弱,对干燥、热和一般消毒剂均甚敏感
E.在蚤粪中存活1个月,在尸体中可活数周至数月