【单选题】she showed me her new dress . 此句属于_______________。
【单选题】Our president made a(n) ____ speech at the opening ceremony of the sports meeting which encouraged the sportsmen greatly.
【简答题】20的约数有1、2、4、5、10、20、….______.
【单选题】Which one can replace the underlined word of the sentence "She showed me her thanks by inviting me to dinner."?
【单选题】将含有天冬氨酸(pI=2.98)、甘氨酸 (pI=5.97)、组氨酸 (pI=7.59)和精氨酸 (pI=10.76)的pH4.5柠檬酸缓冲液,在相同缓冲液的丙烯酰胺凝胶中电泳,这几种氨基酸按正极到负极的电泳顺序依次为
【单选题】为了实现看板管理,在使用看板时必须遵守( )条规则。