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【单选题】
关于脉管系统的组成,正确的是A.
心、动脉、血管和静脉
B.
心、动脉、静脉和循环中的血液
C.
心、血管和淋巴管
D.
心血管系统和淋巴系统
E.
心血管系统和淋巴结
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举一反三
【单选题】A group of mice was released into a large field to which no other mice had access. Immediately after the release, a representative sample of the mice was captured, and the fur color of each individual...
A.
The allele for gray fur color is unstable, and over twenty years most of those alleles mutated to become alleles for black fur.
B.
The field was composed primarily of light-colored soil and little vegetation, affording gray mice protection from predators.
C.
Sexual selection led to increased mating frequency of black and brown versus gray and brown.
D.
The gray mice were hardest to capture and so were underrepresented in the twenty-year sample.
【单选题】如图所示,为Y-△降压起动电路,若与KT线圈串联的常闭辅助触点因故不闭合,其他均正常,则在合上QS三相电源开关,按下SB2后,电动机会______。
A.
电动机只能Y起动和运转
B.
电机仍能Y降压起动，△运转
C.
电机△起动，Y运转
D.
FU4、FU5熔断
【单选题】开放性损伤后预防破伤风的有效措施是
A.
清创并注射青霉素
B.
清创并注射破伤风抗毒素
C.
注射破伤风抗毒素
D.
清创并注射破伤风类毒素
E.
注射人体破伤风球蛋白
【单选题】A 60-year-old previously healthy man sees his physician because he feels feverish and weak. He reports passing dark-colored urine on several occasions during the past month but has no urinary frequenc...
A.
Straining of urine for calculi
B.
Urine microbiologic culture
C.
Abdominal CT scan for renal mass
D.
Collection of a 24-hour urine specimen for protein
E.
Percutaneous renal biopsy
【简答题】Translate the following into Chinese Ultrasonography is useful in locating tumors of the lung and abdominal cavity. It employs ultra high frequency sound waves to form television images of internal or...
【单选题】The crystal thickness and transducer frequency are related. Lower the crystal thickness
A.
The lower the frequency
B.
The higher the frequency
C.
There is no appreciable affect
D.
None of the above
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