关于病毒性心肌炎的预后下列哪项是错误的A．多数可以治愈B．可在短时间内急剧恶化或死亡C．可出现心

In Britain, water will soon be metered, like gas and ______(electrical).

负荷量(loading dose)

A、Median effective concentration

B、Median toxic dose

C、Median lethal dose

D、Median effective dose

负荷剂量(loading dose)

If it has been over 12 hours since you missed a dose，you should ______ ．

A．change the amount of your next dose

B．eat more when taking your next dose

C．have a dose as soon as you remember

D．take the next dose at your regular time

A．trimeter

B．tetrameter

C．pentameter

D．hexameter

半数致死量(median lethal dose,LD50 )