气温.气压和空气湿度的变化都会对飞机性能和仪表指示造成一定的影响，这种影响主要通过他们对空气密度的影响而实现，下列描述哪个正确（）
B
暂无解析
根据外力作用方式的不同，材料的强度分为抗拉、抗压、抗弯、抗剪强度，公式f=F/A是用来计算（）。
We have received your letter of September 12, ______ we are glad to know that you are interested in our electric heaters.
1996年重新提出“政治家办报”要求的是（）
提出“舆论是公众或许多人对他们共同关心或感兴趣的问题(或事件)公开发表出来的意见”的是()
After I _________ a letter I took her to a __________ ________.
We must try to create a more caring, more _____ society.
新闻传播活动的主体是（）
Mrs. Jones had a _____ husband, who would do anything for her.
“新闻之价值者，即注意人数多寡与注意程度深浅之问题也。重要之最近事实，自能引起较多人数与较深程度之注意，故为价值较高之新闻。”这句话指出了新闻的
The missing boys were last seen ________ near the river.
Why couldn ’t you ________ an answer when I asked you why you were late?