【单选题】Usually, taxable items and the amount of tax ______.
A.
have no difference from place to place in the U. S.
B.
are over 15% in the U. S.
C.
have been put an end in the U. S.
D.
vary from place to place in the U. S.
【简答题】有A、B、C、D四种元素,A元素是地壳中含量最多的金属元素;B元素的原子其M层电子数比L层少1个电子;C元素的原子得到2个电子,D元素的原子失去1个电子,所得到的微粒都具有与氖原子相同的电子层结构.回答下列问题: (1)上述四种元素的名称分别是A______B______C______D______; (2)画出A离子、C原子的结构示意图______,______.
【简答题】下列叙述中,正确的是 ( ) A. 在多电子的原子里,能量高的电子通常在离核近的区域内活动 B. 核外电子总是先排在能量低的电子层上,例如只有排满了 M 层后才排 N 层 C. 两种微粒,若核外电子排布完全相同,则其化学性质一定相同 D. 微粒的最外层只能是 8 个电子才稳定
【单选题】浔阳楼,位于九江市,因九江古称浔阳而得名,又因水浒( )曾在此题反诗而闻
【单选题】Today people usually acquire a large amount of botanical knowledge from textbooks.
【简答题】Insurance companies usually pay the same amount ______, Sutter says, so the hospital is left picking up the tab for the more expensive robotic surgery.
【简答题】Today people usually acquire a large amount of botanical knowledge from textbooks.
【单选题】33浔阳楼,位于九江市,因九江古称浔阳而得名,又因水浒( )曾在此题反诗而闻名。
【单选题】Today people usually acquire a large amount of botanical knowledge from text-books.
【单选题】浔阳楼,位于九江市市,因九江古称旬阳而得名,又因水壶()曾在此题反诗而闻名