在测SDI时读取t15的水样体积为（）。

[单选题]已知测得t0=20s；t15=40S，则SDI为（）。A .3.33；B .3.59；C .2.89；D .3.00

[主观题](T15)A．ORIGINB．COMMUNICATE WITHC．WRITTEN DOWND．LEARN A.THE MORE WE READ AND(T13)_______B．WHICH COULD BE(T14)______C．THE(T15)______OF LANGUAGE IS A MYSTERYD．THEY COULD(T16)______EACH OTHER HOW MEN FIRST LEARNT TO INVENT WORDS IS UNKNOWN; IN OTHER WORD

[主观题](T15)A．DROP OUTB．FOR YOUR SOCIETYC．TAKE EFFECTD．THE LAUNCHING PAD A.THE FAMOUS LAW OF DIMINISHING RETURNS BEGINS TO(T13)______B．YOU ARE ON(T14)______C．YOU CAN SUCCESSFULLY(T15)______IN GRADE SCHOOLD．PROVIDE MANPOWER(T16)______ WHEN THEY ADVISE YOUR K

[主观题](T15)A．STOCKS AND SHARESB．GET INTO THE STOCK EXCHANGEC．FROM THE OLD ONED．OF TIME A.NEITHER ALLOWED TO BECOME PARTNERS IN STOCKBROKING FIRMS,NOR TO BE AUTHORIZED DEALERS IN(T13)______B．THE NEW FLOOR IS GOING TO BE DIFFERENT(T14)______C．IT IS ONLY A MA

[主观题](T15)A．SEE THE WORLDB．ALIEN TOC．AT RANDOMD．LIVE IN A.RESIDENTS IN THESE COMMUNITIES WERE PHONED(T13)______AND ASKED THE SAME QUESTIONSB．WHY THE "STANDARD TEMPLATES" OF THE NEWSROOM SEEM(T14)______MANY READERSC．JOURNALISTS ARE MORE LIKELY TO(T15)___

[主观题](T15)A．TEND TOB．CONSIDEREDC．ARISED．THINK OF A.IT MAY BE(T13)______FOOLISHB．MISUNDERSTANDINGS(T14)______BETWEEN PEOPLE FROM CULTURESC．NO ONE WOULD(T15)______KEEPING A BUSINESS FRIENDD．GUESTS(T16)______FEEL THEY ARE NOT HIGHLY REGARDED IN SOCIAL LIFE,

转：外观还不错，适合女孩用。触屏没有诺基亚灵敏。最近上网（本人只收菜）出现死机、QQ浏览器慢等情况（才使用3个月）。只能打开一个网页，系统不支持QQ同步助手软件，功能不多。其余游戏什么的我不玩，无法评价！我想买台OPPO T15的手机,这款怎么样?

[单选题]一名旅客持2月19日北京西—广州T15次硬座车票改乘次日T15次乘车有效期从（）起计算。A . 2月19日B . 2月20日C . 2月21日D . 2月22日

[单选题]在RO预处理系统中，t15/t0大于（）时视多介质过滤器产水合格A .2；B .2.5；C .3；D .3.5

[问答题] 测量含砂时怎样读取砂子体积？