【单选题】Why did it take the scientists a long time to locate the planets?
A.
Because there are too many of them.
B.
Because they are much dimmer than their parent stars.
C.
Because the scientists' method was wrong.
D.
Because they are moving all the time.
【单选题】目前使用的打印机,需使用硒鼓的通常是( ) 打印机.
【判断题】VPN全部采用了“网关对网关”的结构。( )
【单选题】海外网中的《教材改为“十四年抗战”,原因可不简单》一文提到:“国民党为什么不纪念之前那六年抗战,国民党根本就没法儿纪念之前那六年抗战。因为东北三省的沦陷即是国民党和国民政府的“不抵抗”政策导致的,从1931到1937年,中国大地上发生的屡次“局部抗战”,都不是当时的国民党当局想看到的。一直到1936年12月的西安事变,迫于兵谏之形势,蒋介石才同意抗日。所以,国民党没法儿纪念“十四年抗战”。对此理解...
B.
国民党主动承担由于决策失误而导致日本侵华的责任
C.
对国民党来说,抗战起始的时间选择既是历史记忆的选择问题,也是政治取舍的问题
D.
国民党认为八年抗战更能客观地反映中国全民族抗战的历史
【单选题】It is believed by most scientists that______.
A.
the moon was hit by an object as large as Mars
B.
the moon formed from pieces of rock from Mars
C.
the pieces from Mars came together to form. the earth
D.
the moon is made up of materials similar to those of the earth
【单选题】______the bones under the sand,the scientists concluded that they came from the dinosaurs about 65 million years ago.
【单选题】锯削软材料和较大平面及厚材料时应选用____锯条;锯削硬材料和管子或薄材料时应选择____锯条。正确答案是