有三个密码子不编码氨基酸（终止密码子），下列哪个是终止密码子？（） UCG。 UAG。 UGC。 UAA。
如何计算打桩工程量？
The right to limit liability in connection with the ship（）also extended to Charterers and any person interested in or in possession of the vessel and，in particular，any manager or operator of her. has。 takes。 is。 make。
A centrifugal bilge pump requires priming （）. primarily to lubricate the shaft seals。 due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller。 to initially unload the pump by having its head pressure equal to discharge pressure。 in order to overcome the potential energy of water in the discharge line。
说出预算定额中土壤类别的划分。
在遗传密码的64个遗传密码子中，作为起始密码子的是（）
