白喉的传播途径有() A.以飞沫传播为主 B.亦可经玩具、衣物间接传播 C.

题型:多项选择题

问题:

白喉的传播途径有()

A.以飞沫传播为主

B.亦可经玩具、衣物间接传播

C.可通过污染的牛奶和食物引起暴发流行

D.偶可经破损皮肤、黏膜而感染

E.也可通过输血传染

考点:耳鼻咽喉科住院医师传染病防治传染病防治题库
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爆炸威力最强的煤尘浓度为()。

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B

On one of her trips to New York several years ago, Eudora Welty decided to take a couple of New York friends out to dinner. They settled in at a comfortable East Side cafe and within minutes, another customer was approaching their table.

“Hey, aren’t you from Mississippi?” the elegant, white-haired writer remembered being asked by the stranger. “I’m from Mississippi too.”

Without a second thought, the woman joined the Welty party. When her dinner partner showed up, she also pulled up a chair.

“They began telling me all the news of Mississippi,” Welty said. “I didn’t know what my New York friends were thinking.”

Taxis on a rainy New York night are rarer than sunshine. By the time the group got up to leave, it was pouring outside. Welty’s new friends immediately sent a waiter to find a cab. Heading back downtown toward her hotel, her big-city friends were amazed at the turn of events that had changed their Big Apple dinner into a Mississippi.

“My friends said: ‘Now we believe your stories,’” Welty added. “And I said: ‘Now you know. These are the people that make me write them.’”

Sitting on a sofa in her room, Welty, a slim figure in a simple gray dress, looked pleased with this explanation.

“I don’t make them up,” she said of the characters in her fiction these last 50 or so years. “I don’t have to.”

Beauticians, bartenders, piano players and people with purple hats, Welty’s people come from afternoons spent visiting with old friends, from walks through the streets of her native Jackson, Miss., from conversations overheard on a bus. It annoys Welty that, at 78, her left ear has now given out. Sometimes, sitting on a bus or a train, she hears only a fragment(片段) of a particularly interesting story.

The underlined word “them” in Paragraph 6 refers to Welty’s()

A. readers

B. parties

C. friends

D. stories

题型:多项选择题

矩形导线框abcd固定在匀强磁场中,磁感线的方向与导线框所在平面垂直,规定磁场的正方向垂直低面向里,磁感应强度B随时间变化的规律如图所示。若规定顺时针方向为感应电流I的正方向,下列各图中正确的是

[ ]

A.

B.

C.

D.

题型:多项选择题

压浆混凝土与普通混凝土相比,具有( )等特点。

A.强度高

B.收缩率小

C.造价低廉

D.可用于水下加固

E.拌合工作量小

题型:多项选择题

变压器的特点包括()。

A.一种运动的电气设备

B.利用电磁感应原理将一种电压等级的交流电转变成异频率的另一种电压等级的交流电

C.一种静止的电气设备

D.利用电磁感应原理将一种电压等级的交流电转变成同频率的另一种电压等级的交流电

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