为减小雷达测距误差,应选合适量程,使被测回波处于()。A.荧光屏中心附近 B.荧光屏

题型:单项选择题

问题:

为减小雷达测距误差,应选合适量程,使被测回波处于()。

A.荧光屏中心附近

B.荧光屏边缘附近

C.荧光屏离中心2/3半径附近

D.A、B、C均可

考点:海船船员考试雷达雷达题库
题型:单项选择题

患者40岁。子宫切除术后7天, * * 溢液。

明确诊断需作哪项检查()。

A.亚甲蓝试验

B.靛胭脂试验

C.肾显像

D.B型超声

E.排泄性尿路造影

题型:单项选择题

我国的大陆海岸线,从中朝边界的鸭绿江口到中越边界的北仑河口,全长_____公里。(五级、四级)

题型:单项选择题

I was reading Shirley Hazzard’s novel The Transit of Venus. Though I (51) her other books, I had always resisted this one. It (52) me as too pure somehow, too heroic, larger or finer than life and therefore unreal. But now I read it with an almost (53) pleasure. There were sentences that (54) of gratification to my eyes and (55) the hairs on the nape of my neck. I was in a Boston hospital, propped tip in bed with a feeding tube in my arm after (56) surgery for cancer. It was

(57) double room and my roommate, who (58) when he spoke because he had both a broken chin and a drug habit was spraying the air for the fourth or fifth time that day with (59) had a television set and a radio going (60) . The diagnosis of my case was ambiguous. When I asked the doctor the usual question-How much time have I got—he hesitated before answering. "I would say," he said, "that you have in the neighborhood of years.\

53().

A.indescribable 

B.describable 

C.detectable 

D.indetectable

题型:单项选择题

关于细胞信号转导的特征描述正确的是()

A.级联反应的作用类似于一系列的分子开关

B.信号效应的级联反应放大

C.具有复杂性

D.具有趋化性

题型:单项选择题

社会学区别于其他社会科学的根本点在于( )。

A.它是一门综合性的科学

B.它运用科学的研究方法

C.它把社会作为一个整体来看待

D.它的研究经常结合和利用其他社会科学的成果

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