暗视野显微镜要求载玻片和盖玻片需清洁无划痕,载玻片厚度为()。
A.2.5mm
B.2.2mm
C.2.0mm
D.1.8mm
E.1.0mm
参考答案:E
—Sorry I’m late.I got stuck in traffic.
—______.You’re here now.Come in and sit down.
A.You are welcome
B.That’s right
C.I have no idea
D.Never mind
证券市场一般提前对GDP的变动作出反应。( )