【名词&注释】
薄弱环节(weak link)、长期有效(long-term effective)、证书有效期
[单选题]One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is
A. the 'snow' which is sometimes discharged along with the gas is toxic
B. prolonged exposure to high concentrations of CO2 gas causes suffocation
C. rapid dissipation of the CO2 vapor
D. the CO2 gas is lighter than air and a large amount is required to extinguish a fire near the deck
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举一反三：
[单选题]根据ISPS规则的有关要求，SSA应按下列步骤进行______。Ⅰ、船舶保安威胁风险评估Ⅱ、识别船船保安薄弱环节Ⅲ、制订船舶保安计划Ⅳ、策划减轻风险措施
A. Ⅰ→Ⅲ→Ⅱ→Ⅳ
B. Ⅰ→Ⅱ→Ⅲ→Ⅳ
C. Ⅱ→Ⅰ→Ⅳ→Ⅲ
D. Ⅱ→Ⅰ→Ⅲ→Ⅳ
[单选题]下列有关国内航行船舶应具备证书的有效期不正确的是______。
A. 载重线证书有效期5年
B. 客船和货船的适航证书有效期均为5年
C. 吨位证书长期有效
D. 防止油污证书有效期5年
[单选题]If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will_________.
A. backfire through the air intakes
B. develop less power under load
C. have high firing pressures
D. lift its cylinder relief valves
[单选题]If a used lube oil analysis indicates excessive chromate content, this means
A. air filtration is inadequate
B. engine coolant is leaking into the lube oil
C. fuel oil is leaking into the lube oil
D. the piston rings are excessive worn
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