具有较强中枢兴奋作用的拟肾上腺素药物是
A.多巴胺
B.麻黄碱
C.去甲肾上腺素
D.间羟胺
E.异丙肾上腺素
参考答案:B
证券公司、证券投资咨询机构应当向客户提供《风险揭示书》,并由客户签收确认。()
The teachers often tell their students ________ their pens in class.[ ]
A. not to play
B. not to play with
C. to play
D. to play with