【单选题】Which statement concerning reserve sources of energy for GMDSS is FALSE ________.
A.
While the ship is at sea,there must be available at all times a supply of electrical energy sufficient to operate the radio installations and to charge any batteries used as part of a reserve source of energy
B.
Both the VHF and MF/HF installations must be simultaneously supplied
C.
A means of ensuring a continuous supply of electrical power must be provided to all GMDSS equipment that could be affected by an interruption in power
D.
If a UPS or equivalent is used to supply power to the ship's GPS receiver or other source of positional information,a means must be provided to ensure the continuous supply of the information in the event of a failure to the ship's main or emergency source of power
【单选题】The time has come ______ we can make extensive use of nuclear energy.
【判断题】极重短截可强烈削弱枝条生长势和生长量,起到降低枝位,缓和树势的作用。
【简答题】While fossil fuels—still generate roughly 85 percent of the world’s energy supply, it’s clearer than ever that the future belongs to renewable sources such as wind and solar. The move to renewables is...
【单选题】Chemistry is the science of ______ while physics is the science of energy.
【单选题】According to the text, animal welfare groups have succeeded in ______ .
A.
stopping all animal abuse in schools
B.
establishing guidelines that ban classroom experiments harming animals
C.
protecting animals from being experimented with in extracurricular projects
D.
persuading two national science teachers' associations to adopt an animal protection policy
【简答题】A.A pond can be compared to a round-the-clock restaurant. B.All kinds of plans and animals will move in soon after a pond is dug. C.Few of the animals in a pond live on plants. D.Not all the animals i...
【判断题】净含量应与配料清单排在包装物或容器的同一展示版面。