用铂作电极电解某金属氯化物MCln的水溶液,当阳极产生a mol气体时,阴极析出m g金属,则金属的相对原子质量是:
Charles was alone at home, with_______ looking after him.
It is often ______ that human beings are naturally equipped to speak.
I can’t leave. She told me that I ______ stay here until she comes back.
—— Do you mind my opening the window? It’s a bit hot in here. —— ______ , as a matter of fact
It’s high time you had your hair cut ; it’s getting _______ .