据国家统计局资料显示，2014年底我国人均国民总收入达到7400美元，收入水平属于()。
A. 低收入国家
B. 中等偏下国家
C. 中等偏上国家
D. 高收入国家
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You are monitoring VHF Channel 16 when you receive a call to your vessel，TEXAS PRIDE．What
A. This is TEXAS PRIDE．Pick a channel
B. This is TEXAS PRIDE on Channel 16．Come back
C. This is TEXAS PRIDE，WSR 1234，reply Channel 10
D. Please stand by．We're busy right now
Whipping the bitter end of a fiber rope ______．
A. increases the circumference of the rope
B. makes for easier handling
C. prevents fraying of the bitter end
D. prevents moisture from entering the bitter end
Loran-C is which type of navigation system ________．
A. Hyperbolic，long-range navigation system
B. Short-range electronic
C. Long-range，high frequency navigation system
D. Long-range，with a frequency of 1950 kHz
The most effective way of applying carbon dioxide from a portable extinguisher to a fire is by ______．
A. Forming a cloud cover over the flames
B. Directing the gas at the base of the flames in a slow sweeping motion
C. Discharging the carbon dioxide into the heart of the flames
D. Bouncing the discharge off an adjacent bulkhead just above the burning surface
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