设计钢筋混凝土构件保护层厚度时，可不考虑下列何项因素？（）
查看答案
烤瓷合金的热膨胀系数(金a)与瓷粉的热膨胀分数(瓷a)的关系是
A. 金a＞瓷a
B. 金a=瓷a
C. 金a＜瓷a
D. C和B
E. B和A
若有以下程序：
A. 20
B. 24
C. 25
D. 15
Which of the following statements about discoveries of gold deposits is supported by information in the passage？
A. The number of gold discoveries made annually has increased between the time of the original gold rushes and the present.
B. New discoveries of gold deposits are likely to be the result of exploration techniques designed to locate buried mineralization.
C. It is unlikely that newly discovered gold deposits will ever yield as much as did those deposits discovered during the original gold rushes.
D. Modern explorers are divided on the question of the utility of simple prospecting methods as a source of new discoveries of gold deposits.
E. Models based on the theory that gold originated from magmatic fluids have already led to new discoveries of gold deposits.
微信支付 
支付宝支付