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【单选题】
三相桥式全控整流电路，电阻性负载时，当触发角( )时，整流输出电压平均值Ud=2.34U2 COSα。A.
α≤30°
B.
α≤60°
C.
α≤90°
D.
α= 90 °
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【单选题】下列微生物的拉丁名书写正确的是( )
A.
产气肠杆菌 Enterobacter aerogenes
B.
单增李斯特菌 Listeria monocytogenes
C.
上面啤酒酵母 Saccharomyces Cerevisiae
D.
沙眼衣原体 chlamydia trachomatis
E.
青春双歧杆菌 bifidobacterium Adolescentis
【单选题】Such agents as clavulanic acid, sulbactam, or tazobactam are often added to some proprietary (manufactured) penicillin combination products. Which of the followings is the main reason for including th...
A.
Add antibiotic activity against Pseudomonas and many Enterobacter species
B.
Facilitate antibiotic penetration into the central nervous system and cerebrospinal fluid
C.
Inhibit cell wall transpeptidases
D.
Inhibit inactivation of penicillin by b-lactamase-producing bacteria
E.
Inhibit the normally significant hepatic metabolism of the penicillin
【单选题】The organisms, such as ( ), are very difficult to recover using routine culture media.
A.
Streptococcus anginosus
B.
Escherichia coli
C.
Enterobacter cloacae
D.
Mycobacterium tuberculosis
E.
Salmonella paratyphi A
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