血栓闭塞性脉管炎的临床表现包括患肢()
A.皮温降低,色泽苍白
B.感觉异常、疼痛
C.营养障碍改变
D.远侧动脉搏动感弱或者消失
参考答案:A, B, C, D
The teacher asked the boy many questions, but he only answered _____ of them. [ ]
A. some
B. lots
C. each
D. few
可根据氮气和二氧化碳气体的下列哪项性质,将它们区分
A.颜色
B.气味
C.能否使火焰熄灭
D.能否使澄清石灰水变浑浊