皮皮学，免费搜题
登录
搜题
【简答题】
已知向量 OA =(λsinα，λcosα) ， OB =(cosβ，sinβ) ，且α+β=4． （1）求 OA ， OB 的夹角θ的大小； （2）求 | AB | 的最小值．
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
皮皮学刷刷变学霸
举一反三
【单选题】--- Are you in a hurry? --- No, in fact, I’ve got plenty of time. I _______ wait.
A.
can
B.
may
C.
must
D.
Should
查看完整题目与答案
【单选题】患者男性，35岁。近2年常有上腹部隐痛，晚餐后突发上腹部刀割样疼痛，迅速遍及全腹，来院急诊。查体：痛苦面容，腹肌紧张呈板状腹，肠鸣音消失。实验室检查血清淀粉酶值正常。此患者最有可能发生了
A.
急性阑尾炎
B.
急性胰腺炎
C.
溃疡并发出血
D.
溃疡病穿孔
E.
肠梗阻
查看完整题目与答案
【单选题】患者男性.33岁。近2年常有上腹部隐痛，晚餐后突发上腹部刀割样疼痛，迅速遍及全腹，来院急诊。查体：痛苦面容，腹肌紧张呈板状腹，肠鸣音消失。实验室检查血清淀粉酶值正常。此患者最有可能发生了
A.
急性阑尾炎
B.
急性胰腺炎
C.
溃疡并发出血
D.
溃疡病穿孔
E.
肠梗阻
查看完整题目与答案
【单选题】— If only I __ the key with me ! — Then you would not have to wait for your wife's rescue. [      ]
A.
had had
B.
have had
C.
had
D.
have
查看完整题目与答案
【单选题】It's too late for you to wait for the bus. I think I can give you ______ home.
A.
a lift
B.
lift
C.
to lift
D.
lifting
查看完整题目与答案
【单选题】The author thinks that if children are always corrected, they will grow up to be ______.
A.
fearful of making mistakes
B.
too critical of themselves
C.
unable to think for themselves
D.
unable to use basic skills
查看完整题目与答案
【单选题】男性，患者，50岁。半年来反复出现上腹隐痛，食欲减退，消瘦，粪便隐血检查持续阳性。为确诊应采用的最佳检查方法是()。
A.
癌胚抗原检查
B.
纤维胃镜检查
C.
胃液细胞学检查
D.
粪便隐血检查
E.
X线钡餐检查
查看完整题目与答案
【单选题】'And I could always pawn my microscope for three pounds' means the author could always ______.
A.
exchange his microscope for three pounds
B.
borrow his microscope and pays three pounds
C.
have his microscope repaired with three pounds
D.
lend his microscope for three pounds
查看完整题目与答案
【单选题】关于酒店客房计件工资建议方案的描述，不正确的是哪项（）？
A.
考虑同城酒店的员工平衡和流动因素，计件单价标准可参照酒店经营收益向城区报批申请相应的额度，以确保城区内酒店的互通
B.
酒店主管/领班根据《客房服务员工作报表》上记录的确认数量，填写《客房部每日计件统计表》，月底汇总各服务员计件数量和金额，并上交店长审核；
C.
员工计件工资在工资明细单上显示为两块，即基本工资和计件超额工资（计件超额工资=计件工资-基本岗位工资。）
D.
新入职的客房服务员前2个月可不实行计件方案，按客房服务员的试用期工资发放；但需给予工作量目标和质量要求
查看完整题目与答案
【单选题】The attitude of the author is ______ toward motor cars.
A.
ironical
B.
critical
C.
appealing
D.
militant
查看完整题目与答案
相关题目：
【单选题】--- Are you in a hurry? --- No, in fact, I’ve got plenty of time. I _______ wait.
A.
can
B.
may
C.
must
D.
Should
查看完整题目与答案
【单选题】患者男性，35岁。近2年常有上腹部隐痛，晚餐后突发上腹部刀割样疼痛，迅速遍及全腹，来院急诊。查体：痛苦面容，腹肌紧张呈板状腹，肠鸣音消失。实验室检查血清淀粉酶值正常。此患者最有可能发生了
A.
急性阑尾炎
B.
急性胰腺炎
C.
溃疡并发出血
D.
溃疡病穿孔
E.
肠梗阻
查看完整题目与答案
【单选题】患者男性.33岁。近2年常有上腹部隐痛，晚餐后突发上腹部刀割样疼痛，迅速遍及全腹，来院急诊。查体：痛苦面容，腹肌紧张呈板状腹，肠鸣音消失。实验室检查血清淀粉酶值正常。此患者最有可能发生了
A.
急性阑尾炎
B.
急性胰腺炎
C.
溃疡并发出血
D.
溃疡病穿孔
E.
肠梗阻
查看完整题目与答案
【单选题】— If only I __ the key with me ! — Then you would not have to wait for your wife's rescue. [      ]
A.
had had
B.
have had
C.
had
D.
have
查看完整题目与答案
【单选题】It's too late for you to wait for the bus. I think I can give you ______ home.
A.
a lift
B.
lift
C.
to lift
D.
lifting
查看完整题目与答案
【单选题】The author thinks that if children are always corrected, they will grow up to be ______.
A.
fearful of making mistakes
B.
too critical of themselves
C.
unable to think for themselves
D.
unable to use basic skills
查看完整题目与答案
【单选题】男性，患者，50岁。半年来反复出现上腹隐痛，食欲减退，消瘦，粪便隐血检查持续阳性。为确诊应采用的最佳检查方法是()。
A.
癌胚抗原检查
B.
纤维胃镜检查
C.
胃液细胞学检查
D.
粪便隐血检查
E.
X线钡餐检查
查看完整题目与答案
【单选题】'And I could always pawn my microscope for three pounds' means the author could always ______.
A.
exchange his microscope for three pounds
B.
borrow his microscope and pays three pounds
C.
have his microscope repaired with three pounds
D.
lend his microscope for three pounds
查看完整题目与答案
【单选题】关于酒店客房计件工资建议方案的描述，不正确的是哪项（）？
A.
考虑同城酒店的员工平衡和流动因素，计件单价标准可参照酒店经营收益向城区报批申请相应的额度，以确保城区内酒店的互通
B.
酒店主管/领班根据《客房服务员工作报表》上记录的确认数量，填写《客房部每日计件统计表》，月底汇总各服务员计件数量和金额，并上交店长审核；
C.
员工计件工资在工资明细单上显示为两块，即基本工资和计件超额工资（计件超额工资=计件工资-基本岗位工资。）
D.
新入职的客房服务员前2个月可不实行计件方案，按客房服务员的试用期工资发放；但需给予工作量目标和质量要求
查看完整题目与答案
【单选题】The attitude of the author is ______ toward motor cars.
A.
ironical
B.
critical
C.
appealing
D.
militant
查看完整题目与答案