【单选题】给予从叶绿体分离出的基粒以光照,发现能使蓝色的亚甲基蓝(氧化态)变成绿色(还原态),并有氧气释放。此实验证明 [ ]
A.
叶绿素分子存在于基粒膜上,所以光合作用在基粒上进行
B.
光合作用的产物O 2 来自CO 2 而不是来自H 2 O
C.
基粒膜吸收光能后,能促使某种物质分解,产生还原剂和O 2
D.
基粒上的光反应能产生O 2 ,而暗反应使亚甲基蓝还原
【判断题】三显示自动闭塞区段出站色灯信号机显示一个黄色灯光,准许列车由车站出发,表示运行前方有一个闭塞分区空闲。
【判断题】人在知觉过程中把知觉对象从背景中区分出来优先加以清晰地反映的特性叫作知觉的选择性。()
【单选题】将粉料置流化室内利用气流使之悬浮呈流化态,喷入润湿剂或黏合剂,制粒的方法( )
【单选题】某企业向银行借款,甲银行年利率8%,每年计息一次;乙银行年利率8%,每季度计息一次。则( )。
【单选题】Which one of the following is a correct statement concerning duration?
A.
The higher the yield to maturity, the greater the duration
B.
The higher the coupon, the shorter the duration.
C.
The difference in duration can be large between two bonds with different coupons each maturing in more than 15 years.
D.
The duration is the same as term to maturity only in the case of zero-coupon bonds.
E.
The higher the coupon, the shorter the duration; the difference in duration can be large between two bonds with different coupons each maturing in more than 15 years; and the duration is the same as term to maturity only in the case of zero-coupon bonds
【单选题】4一健康女婴,足月顺产后五天,因出现阴道血性分泌物被父母送来医院。该现象最可能是
【简答题】[ A] period [ B] duration [ C] course [ D] length