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【单选题】
As the plane circled over the airport, everyone sensed that something was wrong. The plane was moving unsteadily through the air, and【31】the passengers had fastened their seat belts, they were suddenly thrown forward. At that moment, the air-hostess【32】. She looked very pale, but was quite【33】. Speaking quickly but almost in a whisper, she【34】everyone that the pilot had fainted and asked if any of the passengers knew anything about machines or at least how to drive a car. After a moment's【35】, a man got up and followed the hostess into the pilot's cabin. Moving the pilot aside, the man took his seat and listened carefully to the urgent instructions that were being sent by radio from the airport below. The plane was now dangerously close【36】the ground, but to everyone's relief, it soon began to climb. The man had to【37】the airport several times in order to become【38】with the controls. Therefore the danger had not yet passed. The terrible【39】came when he had to land. Following information, the man guided the plane toward the airfield. It shook violently【40】it touched the ground and then moved rapidly along the runway and after a long run it stopped safely. (31)
A.
although
B.
while
C.
therefore
D.
then
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参考答案:
举一反三
【多选题】关于第一心音描述正确的是
A.
标志着心室收缩的开始
B.
心尖搏动处听诊最清楚
C.
持续时间短,音调高
D.
房室瓣突然关闭
【单选题】在纯电感正弦交流电路中,当电流 A 时,则电压为 ( )
A.
V
B.
V
C.
V
D.
V
【单选题】下列不属于供电系统和电气设备接地的是
A.
工作接地
B.
重复接地
C.
保护接地
D.
PEN接地
【单选题】下列各数中,属于合法的五进制数的是( )
A.
123
B.
216
C.
354
D.
189
【单选题】(2019·青岛模拟)气候是控制某一类植被类型形成及分布的主要因素。我国西北地区黑河上游野牛沟流域高海拔地区发育有典型的高寒草甸植被。下图示意野牛沟流域不同海拔高寒草甸月初地上生物量状况。据此完成24~26题。 该流域在图示海拔范围内高寒草甸地上生物量随海拔升高变化的总体趋势是( )
A.
一直减少
B.
一直增加
C.
先减后增
D.
先增后减
【单选题】在OTL和OCL功率放大电路中,两只功放管的性能应满足( )
A.
管型相同、性能相同
B.
管型相同、性能不同
C.
管型不同、性能相同
D.
管型不同、性能不同
【单选题】气候是控制某一类植被类型形成及分布的主要因素。我国西北地区黑河上游野牛沟流域高海拔地区发育有典型的高寒草甸植被。下图示意野牛沟流域不同海拔高寒草甸月初地上生物量状况。据此完成第 3~5 题。 该流域在图示海拔范围内高寒草甸地上生物量随海拔升高变化的总体趋势是 ( )
A.
一直减少
B.
一直增加
C.
先减后增
D.
先增后减
【多选题】关于第一心音的描述,正确的是
A.
标志着心室收缩的开始
B.
音调较低,持续时间长
C.
主要由房室瓣关闭产生
D.
在第五肋间左锁骨中线内侧听取最清楚
【多选题】下列属于电气设备安全标准的是()。
A.
《电力安全工作规程》
B.
《电气装置安装工程接地装置施工及验收规范》
C.
《用电安全导则》
D.
《低压电工作业人员安全技术培训大纲和考核标准》
【单选题】四肢管状骨CT轴扫图层定位主要依据:
A.
双侧比较
B.
解剖特点
C.
层面注释
D.
图像结构
E.
带扫描线的定位片
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