马克思主义的革命性体现在是无产阶级推翻旧世界、创建新世界的思想武器。()
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If the circumstance of the case admits, don’t alter course to port for a vessel on you own___.
A. starboard side
B. port side
C. stern
D. Head
High clouds, composed of small white flakes or scaly globular masses, and often banded together to form a mackerel sky, would be classified as ______.
A. cirrus
B. cirrocumulus
C. altostratus
D. Cumulonimbus
A vessel trawling would display______.
A. a black ball
B. a basket
C. a double cone,point to point
D. none of the above