When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used _____.（与0805题重复）
A. at high loads to prevent overheating
B. at low loads to prevent corrosion in the boiler
C. during periods of high steam demand
D. when the turbocharger is in operation
牛出血性败血症实验室诊断该病时采用的最好方法是()
A. 采集血液做血常规测定
B. 分离血清，鉴定病毒
C. 采集病料涂片镜检或做细菌培养
D. X光片检查
E. 血清钙测定
机体对细胞内寄生菌感染的防御功能主要依靠
A. 白细胞吞噬
B. 抗体的调理
C. 细胞免疫
D. 补体的调理
E. 溶菌作用
湿性坏疽常发生于()
A. 深部创伤
B. 肺
C. 四肢末端
D. 皮肤
E. 脾
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