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藻类的培养管理应注意什么问题？采收方法有几种？

答案

参考答案：

培养基养料的补给，光照、温度的调节，CO2的补给，搅拌，防污染（很重要），注意酸碱度变化，检查，问题的分析和处理。

采收的方法：物理浓缩（1离心法②重力沉降法③遮光法和降温法）化学浓缩：用沉淀剂如明矾、石灰等，使培养物下沉，而得到浓缩物。此外，较大体积的种类，如丝状体、非浮游性的藻类等可用过滤法采收。

判断题

由单位缴纳的各种社会保障费这部分数据在数据收集过程中直接由住户进行填报。
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单项选择题

Lobbying groups often try to disguise a financial self-interest by clumsily dressing up their arguments in the guise of concern for the public. You see this tendency in the pharmaceutical industry (21) in energy and lumber companies who like to tout their (22) of the environment. But (23) , two new books argue, are these tactics more (24) a cause for concern than in agribusiness.
Marion Nestle’s "Food Safety: Bacteria, Biotechnology, and Bio-terrorism’ looks at the way the American meat and biotechnology industries have (25) successfully on Capitol Hill (26) stricter federal regulation, which the author argues has undermined the safety of the food supply.
(27) , Maxime Schwartz’s "How the Cows Turned Mad" (28) the origins of mad-cow disease over more than two centuries, and reveals the fallout from the British government’s blind (29) that the disease could not be (30) to humans.
In 1999, Ms Nestle writes in her earlier book, Rosemary Mueklow, the executive director of the National Meat Association, lobbied against President Clinton’s (31) to establish a more thorough testing regime for E. coli 0157: H7, a potentially (32) pathogen.
Ms Muck low’s organization—which represents meatpackers and processors who (33) to discard or reprocess meat found to be infected under the new testing regime—argued on Capitol Hill that (34) microbial testing in meat could actually lead to a greater public health risk (35) confident consumers might relax their own safe-handling procedures at home.

A. decreased B. eliminatedC. less D. increased
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