为了同步发电机能稳定运行,要求调速器各自具有()的调速特性。 A.有差 B.无差 C

题型:单项选择题

问题:

为了同步发电机能稳定运行,要求调速器各自具有()的调速特性。

A.有差

B.无差

C.尽量一致

D.相互平行

考点:船舶电气设备及系统船舶电气设备及系统题库
题型:单项选择题

根据对话内容,从对话后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

-Mary, do you want to see the pictures of my holiday in Italy?

  小题1:    

-Ah, it was great! The food was great! The wine was great! But the traffic was terrible!

    小题2:    

-Those Italians are crazy drivers! I don’t want to think about it!

   小题3:    

-Yes, so here’s a picture of the Tower of Pisa.

-How nice!

-It was raining that day, but it was still wonderful. We climbed to the top!

   小题4:      

-That’s a photo of the Arno River. That’s the “Ponte Vecchio”, the old bridge.

     小题5:   

-It was very interesting. There were beautiful old buildings in the city, and lots of wonderful museums.

-That’s nice.

A.And what’s this?

B.Why was t so bad?

C.Yes , it was wonderful.

D.What was Florence like?E. Let’s return to the good parts.

F. Sure, what was your holiday like?

G.  Well, did you like your hotel there?

题型:单项选择题

下面有关组织固定的描述,不正确的是()

A.组织的固定不良,在以后的标本制备过程中无法加以纠正

B.组织的固定不良,在以后的标本制备过程中可以加以适当的纠正

C.机体死亡后,如不及时处理或固定,细胞在自身溶酶体酶的作用下会溶解破坏

D.若用于免疫组化,固定的意义是保存组织细胞的抗原性

E.对于电镜标本,适当而及时的固定非常重要

题型:单项选择题

肩周炎急性期的治疗,正确的是()

A.患肢制动

B.用稍重手法松解粘连

C.急性期不进行肌力训练

D.逐渐进行抗阻肩周肌力训练

E.克服疼痛感坚持关节活动度训练

题型:单项选择题

在一般情况下,钢锭的加热速度越快,其表面温度差()

A.越大

B.越小

C.不受影响

题型:单项选择题

8岁男孩,患急性淋巴细胞白血病已2年,以氨甲蝶呤与6-巯基嘌呤为主进行维持治疗。近3个月来面色苍黄,血象及骨髓象提示:巨幼细胞贫血。以下哪项是其首选疗法()

A.肌内注射甲酰四氢叶酸钙

B.叶酸口服

C.维生素B+叶酸治疗

D.维生素B肌内注射

E.输新鲜少浆血

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