给3 ml液体加热,需使用的仪器有( ) (1)试管(2)烧杯(3)试管夹(4)酒精灯(5)蒸发皿(6)石棉网(7)铁架台(带铁圈) A.(1)(3)(4)(5)B.(2)(4)(6) C.(1)(3)(4) D.(2)(4)(6)(7) 答案:C9、Getting a right job can be difficult ____the students
___prepared to deal with the job interview.
A.if ; won’t
be
B.unless; are
C.unless ; will be
D.if;are