钢轨打磨作业时,最高速度不得超过()km/h。
A.15
B.20
C.25
D.30
参考答案:B
His English isn't very good. You must _______ him. [ ]
A. try help
B. trying to help
C. try to helps
D. try to help
下列对新型隐球菌脑膜炎描述错误的是()。
A.是中枢神经系统最常见的真菌感染
B.临床表现与结核性脑膜炎颇相似
C.常见于有慢性消耗性疾病或全身性免疫缺陷性疾病的患者
D.多急性起病,病情进展快
E.CSF淋巴细胞轻、中度增多,蛋白增高,糖降低,墨汁染色阳性