在时间剖面上回转波与绕射波和凸界面的差异是：回转波的陡度大于绕射波，凸形同相轴能量很

盘状红斑狼疮在口腔粘膜中的好发部位是()

A．颊部

B．舌背

C．下唇唇红

D．上唇唇红

E．上腭

曳引机采用刚性联轴器安装时同轴度要求（）采用弹性联轴器的要求.

A.高于

B.低于

C.无所谓

下列词语的书写全部正确的一项是（  ）

A．紫藤萝 沉淀

B．梦幻茏罩

C．伶仃 遣憾

D．洒酿忍俊不尽

专业技术人员合作与共赢方面的现状

What would be the impact on a firm’ s return on assets ratio (ROA) of the following independent transactions, assuming ROA is less than one Transaction 1: A firm owned investment securities that were classified as available-for-sale and there was a recent decrease in the fair value of these securities. Transaction 2: A firm owned investment securities that were classified as available-for-trading and there was recent increase in the fair value of the securities. Transaction 1 Transaction 2（）① Higher Lower ② Higher Higher ③ Lower Higher

A. ①

B. ②

C. ③