Which of the following should not be paid attetion to as to accommodation for seafarers?()
A. The size of rooms and other accommodation spaces
B. communication
C. Heating and ventilation
D. Noise and vibration and other ambient factor
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羊水过多的常见病因包括________、________、________、________、________等疾病。
发电厂全停对电网有什么影响()?
A. 大容量发电厂全停时使系统失去大量电源,可能导致系统频率事故
B. 导致相关联络线过载等情况
C. 有些发电厂的高压站为电网的枢纽变电站,全停通常将使系统失去多回重要联络线
D. 引发大面积停电事故