第三十四条 中国籍船员应当依照有关船员管理的法律、行政法规的规定取得相应的船员适任证书和健康证明。
翻开修改后的代表法，四个“应当”格外醒目：应当坚持中国共产党的领导；应当以坚持好、完善好、运行好人民代表大会制度为己任；应当坚持以人民为中心；应当忠于宪法。
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Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.
The German firm supplies about three-quarters of the bone cement needed in the NHS. The product is used in more than 1,000 operations a week, mostly in knee replacements, but also in some hip and shoulder replacements.
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