| Passage 3 There are two main types of stocks: common stock and preferred stock. Common stock is, well, common. When people talk about stocks in general they are most likely referring to this type. In fact, the majority of stock issued is in this form. Common shares represent ownership in a company and a claim (dividends) on a portion of profits. Investors get one vote per share to elect the board members, who oversee the major decisions made by management. Over the long term, common stock, by means of capital growth, yields higher returns than almost every other investment. This higher return comes at a cost since common stocks entail the most risk. If a company goes bankrupt and liquidates, the common shareholders will not receive money until the creditors, bondholders, and preferred shareholders are paid. Preferred stock [单项选择]假设分配给用户U1的网络号为192.25.16.0~192.25.31.0，则U1的地址掩码应该为（）。
A. 255.255.255：0 B. 255.255.250.0 C. 255.255.248.0 D. 255.255.240.0 [单选题]乙烯污水场涡凹气浮出水油含量控制指标（ ）。
A.≤40mg/L B.≤30mg/L C.≤20mg/L D.≤10mg/L [判断题]( )工地铝热焊接要进行平直度检查后即可放行列车。
A.正确 B.错误 [单项选择]流脑应实行的隔离方式是（）
A. 严密隔离 B. 消化道隔离 C. 体液隔离 D. 虫媒隔离 E. 呼吸道隔离 [单项选择]甲某因犯危害国家安全罪被通缉在案。一日，甲某秘密到其朋友乙某家中，乙某向甲某提供钱物若干，要其逃往边境乙某的亲戚家躲避。甲某遂于次日逃走。对于乙某的行为应当如何定性( )
A. 构成资敌罪 B. 构成危害国家安全罪共犯 C. 构成包庇罪 D. 构成窝藏罪 [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}}
A. The woman thinks the maid was beautiful. B. The woman thinks the salesman exaggerated his part. C. The woman thinks the salesman was realistic. D. The woman thinks the salesman was not dramatic enough. [判断题]禁止作业人员擅自移动或拆除遮栏（围栏）、标示牌。
A.正确 B.错误 [单选题]自我胎动计数哪项为异常
A.>5次/小时 B.>10次/12小时 C.>20次/12小时 D.>30次/12小时 E.>3次/小时 我来回答: 提交
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