1. Polyploids can arise by somatic
doubling, by the fusion of unreduced gametes, and by means of a triploid bridge.
多倍体产生与体细胞染色体的加倍、未减数配子的融合以及一种叫三倍体桥的方法。
2. Show that
doubling the transmission frequency or
doubling the distance between transmitting antenna and receiving antenna attenuates the power received by 6 dB.
证明:当传输频率增加一倍或者源天线与目的天线的距离增加一倍时,衰减功率等于6分贝。
3. The screen is divided into halves, and each half is scanned simultaneously, thereby
doubling the number of lines refreshed per second and providing a sharper appearance.
萤幕被分成两半,并且一半每一个被同时扫描,因此使加倍线的数量每秒和提供一个骗子恢复精神外表。