【判断题】电子经纬仪的上下半测回限差为±20′′。
【单选题】对关键字序列(56,23,78,92,88,67,19,34)进行增量为3的一趟希尔排序的结果为(28)。
A.
(19,23,56,34,78,67,88,92)
B.
(23,56,78,66,88,92,19,34)
C.
(19,23,34,56,67,78,88,92)
D.
(19,23,67,56,34,78,92,88)
【判断题】三乙醇胺掺入混凝土中后,可加速水泥的水化,使早期生成的水化产物较多,相应地减少了毛细孔率,从而提高混凝土的抗渗性。 ()
【单选题】合纵连横的倡导者中,六国的主要代表是( )。
【单选题】Which action should be taken on receipt of a GMDSS distress alert ________.
A.
Read the display screen and/or printout
C.
Listen for any follow up voice/telex transmission on the appropriate frequency
【单选题】Which information does the outer ring of a compass rose on a nautical chart provide? ______
D.
Annual rate of variation change.