With the help of modern technology, ships are able to receive automated broadcast of safety messages().
A. by day or at night
B. almost round the clock
C. somewhat and sometime
D. from sunrise and sunset
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发现上一循环的二次衬砌混凝土7天强度不合格,作为监理应立即发出哪个指示。
电子电位差计中的起始值电阻RG越大,仪表的起始值越大,则仪表的指示也越高。
A. 正确
B. 错误