太阳光通过（）镜被分为红、橙、黄、绿、青、蓝、紫7种依次排列_爱下问搜题

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问题单项选择题

太阳光通过（）镜被分为红、橙、黄、绿、青、蓝、紫7种依次排列的色带光谱。

A.凸透

B.凹透

C.三菱

D.平面

答案

参考答案：C

选择题

My pen pal said he would write to me, but I ______ any letters from him so far. [ ]

A. won't receive

B. haven't received

C. hadn't received

D. didn't receive

单项选择题

下列属于狭义表外业务的是（）

A.信托

B.担保

C.支付结算

D.租赁