1. [单选题]Piston cooling fins are located
A. atop the piston crown
B. beneath the piston crown
C. at the base of the piston skirt
D. inside the cylinder liner cooling water jacket
2. [单选题]时常患有疖痈的病人,应检查是否患有______。
A. 糖尿病
B. 贫血
C. 胃溃疡
D. 菌痢
3. [单选题]Which of the listed conditions can be considered as the single greatest cause of accident?
A. Speed
B. Excessive knowledge or skill
C. Human error
D. Excitement
4. [单选题]下列哪种船舶应避免在航道内锚泊？________。
A. 任何船舶
B. 帆船
C. 从事捕鱼的船
D. 机动船
5. [单选题]极易与水起反应，生成有毒、腐蚀性气体或烟雾状气体的货物宜选择型船装运。
A. Ⅰ
B. Ⅱ
C. Ⅰ，Ⅱ
