船舶搁浅时，为了使船舶脱险，雇用拖驳强行脱浅的费用为( )
A．实际全损
B．推定全损
C．共同海损
D．单独海损
参考答案：C
The seller should guarantee that the commodities comply ______ the quality, specification and preformance as stipulated in the contract.
A．for
B．in
C．to
D．with
下列哪项没有一过性视力丧失()
A．视网膜中央动脉痉挛
B．急性结膜炎
C．精神刺激性黑矇
D．血压变化
E．直立性低血压
