【单选题】Operators of computers should give instructions to work in the form. of program______.
A.
which are introduced to turn into computers
B.
through which computers could process 'language'
C.
which could tell computers what to do and how to do it
【单选题】How many GMDSS operators are needed/required on board according to the provisions of the International Convention for the Safety of Life at Sea,1974?______.
【单选题】The advertisers and the website operators have the conflict caused by ______.
B.
the ignoring of fraud-detection from website operators.
C.
losing money in 'pay-per-click' advertising.
D.
whether the PPA model should be used.
【单选题】经产妇,36岁。孕32周,水肿1周,血压150/100mmHg,宫高26cm,胎心144次/分,水肿(++),尿蛋白(++)。最可能的诊断是
【单选题】How many operators are needed/required on board according to the provisions of the International Convention for the Safety of Life at Sea,1974? ______.
【单选题】大湖效应指的是冷空气遇到大面积未结冰的水面(通常是湖泊)并从中得到水蒸气和热能,然后在湖泊迎风岸形成雨、雪、雾等现象(见图)冷气团与水面的温差较大时,水温越高,冷气团温度越低,冷气团的水汽就越多,雪量就越大。据此完成下列问题。 有关大湖效应叙述正确的是
A.
大湖效应是冷锋过境造成的强降雪天气,降雪的主要时期是乙图中的④
B.
大湖效应产生的降雪过程原理与冷锋形成过程相同
【简答题】三苯甲醇是一种重要有机合成中间体,可以通过下列原理进行合成: 实验步骤如下: ①如图1所示,在三颈烧瓶中加入A,1.5 g镁屑,在滴液漏斗中加入,6.7 mL溴苯和无水乙醚,先加人1/3混合液于烧瓶中,待镁屑表面有气泡产生时,开始搅拌,并逐滴加入余下的混合液,使反应液保持微沸状态,至反应完全。 ②继续加,A,3.7 g苯甲酰氯和无水乙醚,水浴回流l h 后,在冷水浴下慢慢滴加氯化铵的饱和溶液30....