钢梁和木梁的截面形状和尺寸相同,在受同样大的弯矩时,木梁的应力一定大于钢梁的应力。
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梁弯曲变形时,弯矩最大的截面一定是危险截面。
A. 对
B. 错
凡弯矩图曲线折点处,梁上必有对应点受集中外力作用。
A. 对
B. 错
Write an application letter. Read the following application letter and complete it with the words and phrases in the box.1.I am 2.__________________ the position of Sales Assistant recently 3.__________________ in the New York Weekly. The sales marketing skills I have 4._________________ from my past work experience and my educational background support myself for the position.I worked as a Sales Marketing Assistant at KLM Import and Export in Sydney for over a year (between 2009 and 2010), and I learned how to effectively 5._________________ customers and their demands. The past three and half years I had with Maloka Trade provided me with an opportunity to gain 6.______________________ with developing a large number of sales partners.I would like an opportunity to discuss your specific needs and my work 7.___________ regarding the position of Sales Assistant in your company. You can contact me at (718)234-6767 or email me at Jason.k@hotmail.com. Thank you for 8._______________ me for this position. Please see my résumé in the attachment.9.10.
在配离子溶液中加入( )时,可能会影响配位平衡的移动
A. 沉淀剂
B. 酸或碱
C. 更强的配体
D. 氧化剂或还原剂