三相功率变送器内附有阻抗变换器时，能将输出直流电压量转换为（）量
A. 直流电流
B. 交流电流
C. 交流电压
D. 恒定
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旅游者接受相关组织或者机构的救助后，应当支付应由个人承担的费用。
A. 正确
B. 错误
Every seaman injured on a fishing vessel must reportthe injury to the Master，individual in charge，or otheragent of the employer（）.
A. before the end of the voyage
B. no later than 24 hours after the vessel docks
C. no later than 7 days after the injury occurred
D. only if the injury prevents him from working
砂率就是砂的用量占混凝土总质量的质量百分率。
A. 正确
B. 错误
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